I have been running OSXVNC 1.71 on an XServe running 10.4.4 Server accessing it using CotVNC 2.0b4 running on OSX 10.3.9.
All was well until I updated the Xserve to 10.4.5. Now when I connect using CotVNC after an XServe reboot I get the usual OS X login with an OS X desktop. However as soon as I login the screen corrupts. There are bands of horizontal lines running across the page which corrupts the display to the extent that I can’t see the desktop.
I have since upgraded the Xserve to 10.4.6 using OS X Server Admin but the screen corruption returns again once I login.
It’s really odd that it only happens once I login. It’s fine until I hit the login button!
Does the account you’re logging into use the same screen resolution as the login screen? CotVNC may not handle changes in resolution while it’s connected – if so that would explain why it happens when you log in.
That sounds like what’s happening - part of the update may have even changed the Login and/or User default screen resolution. You might try disconnecting and reconnecting once you’ve logged in.
If you have SSH access to the machine you might also shell in and launch a new VNC server to connect to.