Hello Victor,

It doesn't sound like the OE 8.1B upgrade has installed properly. A 1013 error is usually the sign of an incorrect dictionary.

First, run \SOFTRAK\SYSTEM\CHKSYS.EXE and see if it identifies any inconsistencies in the install.

Something is seriously wrong if the OE detail file cannot be opened.

Do you have a backup from before the dayend process started?