This issue may be seen when you notice that your site server, with package services installed, is not downloading new packages. When you check the site server logs, to investigate, you notice the following errors:
In addition, when you check the c:\windows\system32 directory, you notice many folders with a GUID in their name.
Release: 8.6
This has been confirmed to be a bug.
This issue has been addressed in ITMS version 8.7. There is also a point fix available that addresses this issue for 8.6 RU 3. Please see CUMULATIVE POST ITMS 8.6 RU3 POINT FIXES for the point fix.