The search index could not be updated. The site is misconfigured. Contact an administrator. SQLSTATE[42000]: Syntax error or access violation: 1064 unknown table 'tiki_main_67970848c9392' in delete request
I found my permissions problem. It was not enough to set read/write permissions on the folder. I had to add them to the individual cache files themselves (Win2K/IIS). Now all is working!