VNC Event Error

Hernandez, Magdalena MHernandez "at" westlinemed.com
Thu Jun 21 23:41:02 2007 

Hello,

I see this error in the Event log on servers(win2k or 2003) and PCs
everywhere:
DeviceFrameBuffer: BitBlt failed:5 

What does this mean? 

Thank you,

Magdalena Hernandez
Network Administrator
Westline Medical Management