Yzord, yes I am running KO/Pi. how did you know? I tried a resync, but the problem remained. So, I tried Mikes suggestion of renaming the files.
Mike,
thanks! I renamed the SLDATE files as suggested then restarted calender. I then resynced with my desktop and all seemed to go well. I decided to be brave and resync with KO/Pi, which went surprisingly well. It seemed to accept the calender entries as updates. One or two entries were turned in to recurring entries, but were an easy fix. So far thats all I've noticed. Hopefully, thats all there is to find!
I'm going to keep using KO/Pi, its too good to give up! but i will mention it to zautrix about the corruption and hope he can fix it.
Once again, thanks everyone for helping to sort this out. I am extremely grateful to you all.
Cheers!
Jason