We run Ultra VNC on our roomful of Windows 2003 servers.
On two servers, if you connect, and open Task manager>Performance, you see the CPU maxes out at like 98% (these are fairly new 4 core boxes)
If you disconnect and then connect back using Remote Desktop, the CPU usage is more normal.
We've wiped and reinstalled Windows on these boxes and it made no difference
Also, these boxes run line of business apps and operate normally in every other respect
We use Ultra VNC on several other dual and single core servers, with no problem and no excessive CPU use.
Has anybody seen anything like this?