[Zope] zope-2.2.5, zcatalog and random key error

hi i've commited myself, and took the plunge. i use zope-2.2.5 and zcatalog to serve news articles. articles are catalogaware, and catalog itself when added. navigation, presentation relies on zcatalog. which is good and fast. what's not good though is that i still get the random key error. updating the catalog clears everything up. what caused this error? this is bad, when users come to a page and is greeted with key error. very baad. i'm not sure whether this is cleared in 2.3.x. i think i saw this error once at zope.org what are your experiences? my neck is on the chopping block now :( i hope to try 2.3.x soon, but i'll need to test that out on a dev machine first. help..? thanks