Hi Paolo... Sorry for the delay - have been urgently occupied in other projects... Due to the economical mess the country is in... Here's the patch (from sourceforges' virtual heroines patch manager. It's only one line: --- patch.C~ Tue Mar 13 14:56:41 2001 +++ patch.C Tue Mar 13 14:51:47 2001 @@ -500,6 +500,7 @@ } patches->button_down = 1; patches->new_status = get_value(); + patch->mwindow->draw(); return 0; } I could adapt the guicast to bcast - it's working at the moment, so I don't think they're too different. But it didn't solve the display problem. I haven't had the time to scan the code to find where actually the thumbnails are drawn ( or should be drawn ). Thanks for the hints. John