have an odd situation where randomly my profile.php and profile_edit.php files (UNMODIFED) generate an access denied error, and indicate line 206 char 4.

This is preventing users from updating thier profiles (it says the edit is succesfull on the screen, but the modifications don't stick).

Sometimes it works.. sometimes it doesn't.. totally random.

(I am using 5.4 btw..)

Any experience with this issue?