All kinds of keyboard errors in the parallels.log file seem in Console:
07-26 14:09:17.591 I /hid:637:c07/ [CHIDHostHook] Ungrab keyboard
07-26 14:09:17.591 I /hid:637:c07/ [CHIDHostHook] Send key-up to VM (key: 0x40 [KEY_LEFT_ALT])
07-26 14:09:17.591 I /hid:637:c07/ [CHIDHostHook] Send key-up to VM (key: 0x41 [KEY_SPACE])
07-26 14:09:17.592 I /hid:637:c07/ [HIDMacHook] kbd types detected -> ANSI:yes ISO:no JIS:no AUX:no
07-26 14:09:17.592 I CPTOOL /gui:637:c07/ ClientCommunicator::send cmd=9 sender='{c341563f-f9c2-439f-bb98-3697ceeaee7a}' recipient='{983de386-dd44-47c0-9153-c36a944c73a3}'
07-26 14:09:17.592 I CPTOOL /gui:637:c07/ ClientCommunicator::send cmd=7 sender='{983de386-dd44-47c0-9153-c36a944c73a3}' recipient='{c341563f-f9c2-439f-bb98-3697ceeaee7a}'
07-26 14:09:17.592 I CPTOOL /gui:637:c07/ CPTOOL_SET_DELAYED_PASTE is received
07-26 14:09:17.592 I CPTOOL /gui:637:c07/ PasteboardPutItemFlavor... (inItem=1 flavor='public.utf16-plain-text') ok.
07-26 14:09:17.592 I CPTOOL /gui:637:c07/ PasteboardPutItemFlavor... (inItem=1 flavor='public.utf8-plain-text') ok.
07-26 14:09:17.592 I CPTOOL /gui:637:c07/ PasteboardPutItemFlavor... (inItem=1 flavor='com.apple.traditional-mac-plain-text') ok.
07-26 14:09:17.592 I CPTOOL /gui:637:c07/ PasteboardPutItemFlavor... (inItem=1 flavor='public.rtf') ok.
07-26 14:09:17.618 I CPTOOL /gui:637:c07/ ClientCommunicator::send cmd=3 sender='' recipient='{983de386-dd44-47c0-9153-c36a944c73a3}'
07-26 14:09:17.618 I /gui:637:6803/ CCPDispatcher::Receive
07-26 14:09:17.618 I CPTOOL /gui:637:6803/ ClientCommunicator::send cmd=2 sender='{c341563f-f9c2-439f-bb98-3697ceeaee7a}' recipient='{983de386-dd44-47c0-9153-c36a944c73a3}'
07-26 14:09:17.620 I /gui:637:6803/ CCPDispatcher::Receive
07-26 14:09:17.620 I CPTOOL /gui:637:6803/ ClientCommunicator::send cmd=4 sender='{c341563f-f9c2-439f-bb98-3697ceeaee7a}' recipient='{c341563f-f9c2-439f-bb98-3697ceeaee7a}'
07-26 14:09:17.620 I CPTOOL /gui:637:6803/ CPTOOL_ACCEPT_BUFFER is received
07-26 14:09:17.620 I CPTOOL /gui:637:c07/ relay was received. clipboardData.isEmpty=0
07-26 14:09:26.155 I /hid:637:c07/ [CHIDHostHook] Grab keyboard (win: 0, with hotkeys: no, guest id: Windows 7)
07-26 14:09:26.181 W /hid:637:c07/ [CHIDMacHook::CreateIgnoreActionList] action already exists (vk_code 00000071 vk_mod 00000000 prl_key 0000006e prl_mod 40000000)
07-26 14:09:26.181 W /hid:637:c07/ [CHIDMacHook::CreateIgnoreActionList] action already exists (vk_code 00000031 vk_mod 00000100 prl_key 00000041 prl_mod 400000c0)
07-26 14:09:26.181 W /hid:637:c07/ [CHIDMacHook::CreateIgnoreActionList] action already exists (vk_code 00000031 vk_mod 00000900 prl_key 00000041 prl_mod 400000f0)
07-26 14:09:26.181 F /VmKeyboard:637:c07/ [Keyboard] Not defined convertion for 0 131
07-26 14:09:26.181 F /hid:637:c07/ [CHIDMacHook::CreateIgnoreActionList] invalid prl key code (vk_code 00000083 vk_mod 00000000 prl_key 00000000 prl_mod 40000000)
07-26 14:09:26.181 F /VmKeyboard:637:c07/ [Keyboard] Not defined convertion for 0 255
07-26 14:09:26.181 F /hid:637:c07/ [CHIDMacHook::CreateIgnoreActionList] invalid prl key code (vk_code 0000ffff vk_mod 00000200 prl_key 00000000 prl_mod 40000000)
07-26 14:09:26.181 F /VmKeyboard:637:c07/ [Keyboard] Not defined convertion for 0 131
07-26 14:09:26.181 F /hid:637:c07/ [CHIDMacHook::CreateIgnoreActionList] invalid prl key code (vk_code 00000083 vk_mod 00000000 prl_key 00000000 prl_mod 40000000)
07-26 14:09:26.181 F /VmKeyboard:637:c07/ [Keyboard] Not defined convertion for 0 131
07-26 14:09:26.181 F /hid:637:c07/ [CHIDMacHook::CreateIgnoreActionList] invalid prl key code (vk_code 00000083 vk_mod 00000200 prl_key 00000000 prl_mod 40000000)
07-26 14:09:26.181 I CPTOOL /gui:637:c07/ ClientCommunicator::send cmd=9 sender='{c341563f-f9c2-439f-bb98-3697ceeaee7a}' recipient='{c341563f-f9c2-439f-bb98-3697ceeaee7a}'
07-26 14:09:26.181 I CPTOOL /gui:637:c07/ CPTOOL_CHECK_FOR_BUFFER_UPDATED is received
07-26 14:09:26.181 I CPTOOL /gui:637:c07/ Check for buffer updated
07-26 14:09:26.182 F /hid:637:c07/ [CHIDHostHook] Key action passed here is invalid.
07-26 14:09:26.182 F /hid:637:c07/ [CHIDHostHook] Action exists, but rewrite not allowed.
07-26 14:09:26.258 F /hid:637:11823/ [CheckKeyState] Invalid key state transition: [KEY_ESCAPE] (09,00) -> (09,00)
07-26 14:09:28.339 I /hid:637:c07/ [CHIDHostHook] Ungrab keyboard
07-26 14:09:28.339 I /hid:637:c07/ [CHIDHostHook] Send key-up to VM (key: 0x40 [KEY_LEFT_ALT])
07-26 14:09:28.339 I /hid:637:c07/ [CHIDHostHook] Send key-up to VM (key: 0x41 [KEY_SPACE])
07-26 14:09:28.340 I /hid:637:c07/ [HIDMacHook] kbd types detected -> ANSI:yes ISO:no JIS:no AUX:no
07-26 14:09:28.340 I CPTOOL /gui:637:c07/ ClientCommunicator::send cmd=9 sender='{c341563f-f9c2-439f-bb98-3697ceeaee7a}' recipient='{983de386-dd44-47c0-9153-c36a944c73a3}'
07-26 14:09:41.359 I /hid:637:c07/ [CHIDHostHook] Grab keyboard (win: 0, with hotkeys: no, guest id: Windows 7)
07-26 14:09:41.362 W /hid:637:c07/ [CHIDMacHook::CreateIgnoreActionList] action already exists (vk_code 00000071 vk_mod 00000000 prl_key 0000006e prl_mod 40000000)
07-26 14:09:41.362 W /hid:637:c07/ [CHIDMacHook::CreateIgnoreActionList] action already exists (vk_code 00000031 vk_mod 00000100 prl_key 00000041 prl_mod 400000c0)
07-26 14:09:41.362 W /hid:637:c07/ [CHIDMacHook::CreateIgnoreActionList] action already exists (vk_code 00000031 vk_mod 00000900 prl_key 00000041 prl_mod 400000f0)
07-26 14:09:41.363 F /VmKeyboard:637:c07/ [Keyboard] Not defined convertion for 0 131
07-26 14:09:41.363 F /hid:637:c07/ [CHIDMacHook::CreateIgnoreActionList] invalid prl key code (vk_code 00000083 vk_mod 00000000 prl_key 00000000 prl_mod 40000000)
07-26 14:09:41.363 F /VmKeyboard:637:c07/ [Keyboard] Not defined convertion for 0 255
07-26 14:09:41.363 F /hid:637:c07/ [CHIDMacHook::CreateIgnoreActionList] invalid prl key code (vk_code 0000ffff vk_mod 00000200 prl_key 00000000 prl_mod 40000000)
07-26 14:09:41.363 F /VmKeyboard:637:c07/ [Keyboard] Not defined convertion for 0 131
07-26 14:09:41.363 F /hid:637:c07/ [CHIDMacHook::CreateIgnoreActionList] invalid prl key code (vk_code 00000083 vk_mod 00000000 prl_key 00000000 prl_mod 40000000)
07-26 14:09:41.363 F /VmKeyboard:637:c07/ [Keyboard] Not defined convertion for 0 131
07-26 14:09:41.363 F /hid:637:c07/ [CHIDMacHook::CreateIgnoreActionList] invalid prl key code (vk_code 00000083 vk_mod 00000200 prl_key 00000000 prl_mod 40000000)
07-26 14:09:41.363 I CPTOOL /gui:637:c07/ ClientCommunicator::send cmd=9 sender='{c341563f-f9c2-439f-bb98-3697ceeaee7a}' recipient='{c341563f-f9c2-439f-bb98-3697ceeaee7a}'
07-26 14:09:41.363 I CPTOOL /gui:637:c07/ CPTOOL_CHECK_FOR_BUFFER_UPDATED is received
07-26 14:09:41.363 I CPTOOL /gui:637:c07/ Check for buffer updated
07-26 14:09:41.363 F /hid:637:c07/ [CHIDHostHook] Key action passed here is invalid.
07-26 14:09:41.364 F /hid:637:c07/ [CHIDHostHook] Action exists, but rewrite not allowed.
07-26 14:09:41.418 F /hid:637:11823/ [CheckKeyState] Invalid key state transition: [KEY_ESCAPE] (09,00) -> (09,00)
07-26 14:09:55.008 I /hid:637:c07/ [CHIDHostHook] Ungrab keyboard
07-26 14:09:55.008 I /hid:637:c07/ [HIDMacHook] kbd types detected -> ANSI:yes ISO:no JIS:no AUX:no
07-26 14:09:55.008 I CPTOOL /gui:637:c07/ ClientCommunicator::send cmd=9 sender='{c341563f-f9c2-439f-bb98-3697ceeaee7a}' recipient='{983de386-dd44-47c0-9153-c36a944c73a3}'