Thank you. We are investigating this issue and will get back to you on this soon as we can.
Have you tried removing and reinstalling Parallels Access on the remote machine? If not, then please remove Parallels Access on the iMac by following this article, reboot the iMac, log into your Parallels account at https://account.parallels.com/ and reinstall Parallels Access by following this article.
Should the issue persist, please check for the issue on the iMac from a different computer and also with a different browser.
Actually, the steps mentioned in the article we provided earlier are only applicable for scenarios where users play a computer game on the remote computer and the mouse doesn't work in the game. Here, the options mentioned in the article are actually in-game options, not Parallels Access options. If those steps are irrelevant in your case, then please ignore the same. But I do want you to try the steps suggested right above. Let us know how it goes.
Last edited: Apr 15, 2017