[Zope] weird bug?

hi, one of the DTML methods i've created recently has started to create problems. the method adds properties to documents as people browse zope. it worked fine for a while but now it's causing zope to prompt for a password. i gave the method manager proxy which solved the problem on my test server but didn't make a difference on the intranet zope. the error generated when you click Cancel on the password prompt is "You are not authorized to access manage_addProperties." as far as i know nobody has changed anything related to permissions. is there some kind of bug causing this? the method is being run on version 1.5.2. any ideas appreciated. -<mike>-