I've also duplicated this issue on my own network. Ubuntu 9.04 32bit running on a simple HP laptop and using Macbook Pro OSX 10.5 to remote to the Linux machine. I can watch it from across the room and see it responding as normal but if I watch the local VNC window it's a static image, as if it's frozen. Quite an interesting bug. Now we need someone smart to fix it!
I've also duplicated this issue on my own network. Ubuntu 9.04 32bit running on a simple HP laptop and using Macbook Pro OSX 10.5 to remote to the Linux machine. I can watch it from across the room and see it responding as normal but if I watch the local VNC window it's a static image, as if it's frozen. Quite an interesting bug. Now we need someone smart to fix it!