Greg;
Your help has been greatly appreciated. Your latest formulae are perfect!
1. It is reasonable to assume at this point that the Excel screen "jiggling" or "pulsating" problem observed in both scenarios of the Conditional Format returning TRUE or FALSE :
....1.a can't be hardware related, since it is encountered on 2 different brand name computers
....1.b
can't be Conditional Format related, since it occurs even with no conditional format cells (only the timer macros and the events in a new w/b)
....1.c can't be Excel related, since it is encountered with 2 different versions of Excel (XL2000 & XL 2003)
....1.d can't be Operating System related, since it occurs with 2 different OS (Windows 95 & Windows XP)
2. The only items left on the check-list is the RepeatOneSec() macro, but you didn't encounter such problem when you tried the timer (right?)
Could it be that my procedure is at fault ? (Activate & Deactivate w/s events, Open & BeforeClose w/b events, and RepeatOneSec() & EndProcess() in a regular module). Are you using the exact procedure ?
3. The most surprising by far is the observation 1.b above. The w/s in the new w/b has absolutely nothing on it (
except the events and the timer macro). Yet, the Excel screen, the mouse pointer, the task bar Ready, etc. still "jiggle" at random, probably at the one-second intervals of the timer !!!!!
4. Do you think Excel::Tools::Options may have something to do with the timer not running quietly?
I just hate to give-up at this point having gone that far!
Thanks again.