Seems to me, tiki does not like it when you turn certain features off. Specifically the wiki. My site has no use for the wiki but turning it off causes some issues with others parts of the site, for example creating ajax errors in the rich text editor.
While I understand this is not a module based cms and everything has a dependence to other parts it would be nice to be able to turn off features you don't want, need without a negative domino effect on others. I shouldn't be forced to have the wiki page up, on the main menu if I have 0 need for it.
My 2 coppers