Hello, i seem to have got it working.
I started enigma2 with the DVB-C/T2 attached only, when enigma2 started i then plugged in DVB-S2 tuner, opened Sundtek control panel and configured second tuner.
On pressing Blue button enigma2 restarted and the tuner is present, i will test during the day.
So if tuners in slots does not match last config enigma 2 does not boot.
I have to go out this morning, if you want to have a fine tune of the plug in this afternoon then i may be avilable.
Please let me know.