This doesn’t happen everyday. However, sometimes when closing down UFT I’ll get a ‘invalid window handle’ error. It’s an endless amount of popups, unless you go into task manager and kill the UFT process (or reboot)..I’d just like to know what I can do to prevent that error

We haven’t had an other UFT 15.0.2. user report this issue, nor have we seen it ourselves, so I’m suspecting that perhaps it could be a glitch with your installation.