I have an Access database (2000 version) running on my plant floor which rotates a series of form displays. The rotation of the open / close of the forms is controlled by a macro that executes every 10 seconds using the timer event property on forms. Occassionally, the macro failes to execute resulting in the display showing a "HALT" message. This is rare...i can count on one hand how many times the rotation has stoped (since November 2010 when we deployed the application) and as a result, I am unalbe to determine why the error is occuring. Any thoughts? The only way to fix the HALT error is to close and reopen the database. The DB is split, with 5 copies of front ends running on PC's linked to back end tables which resides on our local server / share, but only one PC services the 4 monitor / displays running the rotation sequence. Thanks.