I have BuddyPress installed and it is asking to change the default permalinks. BuddyPress will not work with the default. Once I change the default to any other option, the categories break and the posts will not show up anywhere. I cant find a way to fix it. I have reinstalled WP and need a solution prior to reinstalling BuddyPress.
I have the same error here and it seems to me that the problem is somehow related to the warning-message i get:
Warning: in_array() [function.in-array]: Wrong datatype for second argument in /is/htdocs/…/bp-core.php on line 315 (the last line in the following code)