Источник:
http://gatesasbait.spaces.live.com/B...B9F5!245.entry
==============
Good morning,
If you get the following error when starting up a Dynamics AX 4 client and just can't see anything wrong with the configuration or anything else; look into the following folder on your local machine "\Documents and Settings\\Local Settings\Application Data\" for a file named "ax__.auc" and rename it or delete it. This file stores a local cache of objects and for some reason that I don't know, sometimes gets corrupted.

Источник:
http://gatesasbait.spaces.live.com/B...B9F5!245.entry