I am in an environment that currently has PCAnywhere(10.5). We are
going from 3.2 to 6.5 SP1 Hotfix. The plan was to get rid of PCA after
we trained people to use and configure Remote Management. The issue we
get is that the workstation video driver get corrupted. By this I mean
that if you check the Setting of the video driver you will see it only
has 16 colors now. The screen is fine until there is either a user or
system event that triggers a video change. Then the user is left with
16 colors.
There is a fix that seems to work some what.
C:\Progam Files\Novell\Zenworks\RemeoteManagement\RMagent\rm setdrv.exe

The issue seems to related to drishti and darpan drivers.