fast scrolling launches gnome-search-tool

When I am in large windows of various applications and
scroll very fast suddenly a gnome window pops up with
“Search for Files”. Apparently the scrolling somehow
triggers an automatic launch of gnome-search-tool.

I looked through many of the obvious places “Keyboard
Shortcuts”, “Sessions”, etc but could not find a place
to switch this behavior off. It is very annoying.

Any suggestions?

SUSE 11.1 Gnome Logitech mouse with “hyper-fast” scrolling.

Thanks, Thomas