Thank You BBJN56!
I have no idea that what "embedded stairs" really means. I try to check and translate it but not found any rational explantion.
Anyway - it's very odd that service works Fenix A 320, Maddog -82, inibuilds A300-600 but PMDG 737-800 (I try with it, too) not work because there is an old problem it (all buttons freezed again).
Today I tryed again to check GSX. I went to inbuilds EGLL gate 527 with BAE 146-300 and asked service. No luck - same problems as I descripted my earlier post.
Then I change an aircraft and take inibuilds A300-600 Cargo version and went to Parking 608 and everything works like charm.
So result is that Umberto aka Virtual has been done to update 3.1.6 and he only knows that what it is but he stay silence so we can only quess.
I will try later today Yours advice, ofcourse and report back as I have a little bit time to do it.
Thank You
Rolf