No it isn't permissions. I did a clean install and went through the whole thing from scratch (including redoing a complete DB) still has the same issue. If you clear everything in the cache file and use the cache clear option... 3 things are not rebuilt during it...

1. Top 30 Posters
2. Top Posters
3. Public calendar

I tried it about 4 times this afternoon 2 with a completely new DB and it those three did not transfer from Cachebuilder to Cache.