No problem in starting the same DTP, but under different users with different filters.
I have installed:
Extraction Mode - FULL
Processing Mode - Serial Extraction, Immediete Parallel Processing
Also available processing mode - Serially in the dialog process. But this is obviously not what I need.
This implementation has worked for many years. But recently started having problems with blocking DTP. Apparently something has changed in the architecture of DTP. You do not know about this issue?