version of gizmo is always seen on my pictures, isn't it!?
beside I used the installer of my TBM900 in the last version before and it did not work.
but well, its working now!
firewall has been off the whole time and windows defender should not block it, since the whole x-plane folder is excluded!?
update: after reinstalling IXEG 737 Classic v1.3.3 and the gizmo plugin what comes with it, activation successful!