Why do I constantly get Copy this file into pop up?

Literally impossible to go through the MediaBay with mouse because of this pop up! I can’t even understand why it comes up! Can anybody point me out?

I disabled left browsing window and the bug dissipated! Finally, that was scaring me away from Media Bay for ages!

PS: I’d like to reccomend ADSR sample library, it auto-tagging samples and creative workflow gets x100 faster. Also you can play every sample with Midi keyboard (sampler mode) and d&d into Cubase. Really useful!