OK, i've found the cause of the issue. A bmap image path was wrong in the test_app.
The fix uncovered two DXERRORs that I must to investigate further.

Thanks 3run for your help.

I hope in the next days I can upload all the fixes. At least partially one or more.
Your report showed me, I must to do the tests in Windows too.
Interesting thing, the DXERRORs don't show up in Linux.

If you interested in the progression, just watch the project Activity under the Summary page and/or the Files page at the project.