"All versions of CDU and CPU are incompatible with Mac OS 7.6. The symptoms of the incompatibility are cosmetic: garbled video in the menu bar, windows, and dialog boxes. Because there are no work-arounds for this incompatibility, users of MacOS 7.6 need to remove or otherwise disable CDU/CPU. At this time Connectix does not have any updates planned for CDU or CPU..."
The same page also offers the following comment about MODE 32:
"Mac OS 7.6 is not compatible with the Mac II, IIx, IIcx, or SE/30. Since Mac OS 7.6 does not run on these systems, Connectix MODE32 cannot install nor function. MODE32 version 7.5 continues to function on all versions of System 7 prior to Mac OS 7.6."
Finally, reader S.W. Achramowicz reports a possible Mac OS 7.6 conflict with Connectix' Color QuickCam. He writes: "Upon reinstalling my Color QuickCam Software (2.1a) on my Power Mac 8500 with System 7.6, I crash immediately upon the load of the QuickCam extension, according to Conflict Catcher 3.0.4." The problem does not occur with System 7.5.x.