Thanks!
But unfortunately - it did not help. I can check values of ["x"] and ["y"] of name, and I can see that it is updated, but nothing changes in ui... I have tried several values of x and y, from 100 to 1400 - no effect.
I also grepped the addons folder and the only addon that uses "Talisman0Slot" is ExtendedActionBar but it uses it only to store the using the amulet as one of possibilities, it does not hide or show the frame...
Oh, well, I can live without it. But it is intriguing - any more hints about how to investigate it further would be very much welcome!
PS: Just to make sure we are talking about the same: I meant a frame like the one visible in the attachment (old screenshot when the frame was visible).