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.