Problems with Skype, AdobeReader and file sharing in Parallels 18.3.1

Setting:
Fresh installation of MacOS 13.4 in host and guest.
Parallels Desktop 18.3.1
Fresh installation from Skype (Downloaded from Microsoft)
Fresh Installation from Adobe Acrobat Reader (Downloaded from Adobe)

Problem 1: Skype is showing a broken login screen:

• After starting Skype i get a window with a cyan to green fade In the upper half and black in the lower half but no text.
• I found in this post ( https://forum.parallels.com/threads/macosx-high-sierra-guest-graphics-issues.344640/#post-865475 ) that adding --disable-gpu as parameter to the command in the terminal might help. That solved the problem for the login screen.
• Is there a possibility to start Skype with that parameter without needing the terminal?

Problem 2: Adobe shows a error message after start then a big grey box and can neither used nor stopped.

• Adobe starts and i can see the main window with last files. After some seconds an error message box occurs with the message: "Adobe has encountered a problem. Some features may not work as expected.". After pressing "OK" a big grey box occurs and nothing is clickable in the Adobe window. The menu entry "Quit Adobe Acrobat Reader" is not clickable.
  
• Same try as for Skype above: The main window is useable. After clicking on the "Welcome"-PDF to edit it the again the message from above. A greyish window is above the viewed PDF (this time with window decoration). After closing that same message again. OK -> greyish window without window decoration (not close able). Again the menu entry "Quit Adobe Acrobat Reader" is not clickable.
• Tried reinstallation -> same results.
• Any ideas?

Problem 3: Shared folder from host is sometimes not available from guest.

• Via "System Settings > General > File Sharing" i shared a folder from host to the guest.
• Usually the guest finds the host and the shared folder is available in the guest. Sometimes the host is not reachable from the guest.
• If i am logged in to a WIFI network with the host it seems to work often.
• If WIFI is disabled accessing the host from the guest fails often.
• The Mac will be used in a setting where in the most cases the network is not provided over WLAN. So this might be a problem.