I found and fixed the bug (being unable to switch to a particular PLP in a T2-MI transmission received by XTASI-S2+and TBS. Version 0.9.61 is ready for download (
http://www.4t2.eu/ccount/click.php?id=1).
The reason was a too small buffer, which was not able to take one bunch of the hardware. BTW, it was reported in the log file as a continuos "internal buffer overflow" .
I was able to use the T2-MI test stream on 5W, 12669 H, DVB-S2/8PSK, Root 8 which contains one PLP with the RS "Diver" in.
Please, next time you run into trouble, let me know earlier.