I've been running CellQuest 1.1.1 on a Facscan and Facstar+ (also Quadra 650's)
under System 7.5.1 for several months now. We haven't seen any major problems.
In fact there seem to be less crashes now than under System 7.1. The program
has the odd hiccup communicating with the Sentinel Eve dongle, popping up
a message saying it can't find it, but this is only an irritation (need to
click "OK") and happened under System 7.1 also. The only thing I have been
able to find that might be peculiar to CellQuest/System 7.5 is that an open
parameter description window (the one containing the folder and filename
options) routinely disappears from sight as soon as you move a region! (?!)
-- David.