Hi there Flo,
Whenever I file a flight plan with ATC it is always the FSX Plan (and always IFR), and yes, I am familiar with reading and interperting SID's and STARS.
Out of curiousity I did a 'quick' Zurich(LSZH)-Frankfurt Main (EDDF) yesterday on a BBS Swiss Airbus 320 - same thing again: I get the announcement I am "X Miles from EDDF, expect vectors for runway XX, descend FLXXX and turn heading XXX" which, again, is in the opposite direction to EDDF. But I continue and after no further instructions for nearly 50 nm, I then get the instructions to turn to heading XXX, and think, "ok, we're getting somewhere", but almost immediately, "IFR is cancelled". I have checked and double checked, and of course, I am acknowledging all instructions.
Any further thoughts?