How are you generating the dumps, exactly?
Using the process name (ashDisp.exe) or process ID?
Process ID would be better - as you're running multiple instances of the program. Maybe userdump is generating dump for the other copy.
To use the process ID, first enable its display in the Task Manager (View -> Select Columns and check the "PID" box). The will allow you to see the ID of the offending process. The run userdump as follows
userdump.exe 1234 c:\aswdisp.dmp
(replace 1234 by the real Process ID of the ashDisp.exe process).
Cheers
Vlk