Mysteroius rev ghost buttons

[Tiemo Hollmann TB]

Hello,

I have a very strange phenomenon. After some time (10-30 clicks), using my
standalone on Mac (created on Win) 3 rev buttons appear somewhere in the
upper third of my application. The labels of the 3 buttons are:
"revGeometryBack" "revCommon" and "revLibURL" Using the standalone on Win,
they don't appear. I realy don't know what strange phenomenon this is and
what I can do to prevent it. Has anyone ever seen these three buttons?

Any hint appreciated!

Tiemo