This sounds like a coms problem.
Using the LEDs (smoothed) creates a lot of coms traffic to the LCD module.
If you running a screen that also needs a lot of updates (like changing custom characters), then packets can be dropped and screen corruption occurs.
Its an ongoing problem, ive been trying to fix it for a very long time now with limited success.
This may be, but if anyone were going to have problem, it would be me. With 5 (sometimes 6) displays, along with 5 (or more) additional USB devices (not COM related, tho), it would seem as tho I would be a prime candidate for such a problem.
Perhaps it may be more related to the physical HW, OS, BIOS setting or some other setting. If LED related (and smoothing suspected), perhaps we should document the setting in the 635 file. For me:
led01_order=5
led01_smooth=7
led01_id_value=1954674400
led01_value_max=100.000000
led01_value_min=50.000000
led02_order=5
led02_smooth=7
led02_id_value=1954674400
led02_value_max=50.000000
led02_value_min=0.000000
led03_order=5
led03_smooth=7
led03_id_value=2997961695
led03_value_max=100.000000
led03_value_min=50.000000
led04_order=5
led04_smooth=7
led04_id_value=2997961695
led04_value_max=50.000000
led04_value_min=0.000000
Also, this is probably not the problem, but recently (twice in past few weeks), I had an issue where the cc2_service.ini seemed to become corrupted. I had copied it over from my previous XP install. OF course, it was most likely a Vista thing!
Anyway, when I restarted CC2, the 635 and 634 would be blank, CC2 would run for about 10 seconds and then shutdown. I solved it (the 2nd time) by deleting the 634 and adding it back.
I'm not sure if anyone posting here actually deleted ALL the ini files and simply started from scratch. This would make me winch (real bad) if someone asked me to do this, but it is worth a shot, if anyone has not tried this yet.
Jim