Temporary folders are not cleaned up after ArcMap closes

Description

** This issue is addressed in ArcGIS 9.1 Service Pack 1 (SP1) **

Temporary folders with a prefix of SCH are getting created every time that a diagram is created or opened in ArcMap. These folders are not getting deleted properly.

Cause

This is a known issue.

Workaround

Note:
This issue is addressed in ArcGIS 9.1 Service Pack 1 (SP1).