The server-side MicroStation engine used for processing DGN/DWG files displays a system level modal dialog in the event of a system level error. If this occurs, MicroStation will hang and prevent jobs using the engine from completing. To suppress the display of this modal dialog, set the following registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Windows\ErrorMode
= 2

This registry setting applies to all processes running on the computer. No system level error dialogs will pop up on the computer, however, the error(s) will be written to the system log. This is a recommended setting on server computers. On client computers, just be aware that the system will log exceptions without notifying you through a modal dialog.