Hi Kitchin,
You got it spot on! Thank you so much!
I commented out line 79 in nextgen-gallery/products/photocrati_nextgen/modules/ajax/module.ajax.php and the Flash plug-in is not showing up anymore. It’s indeed the Flash plug-in is from this file.
I totally agree with you that no one wants suspicious activity on a login page, especially it just appears for a split second and you can’t help to wonder what is it doing there.
Once again, thank you!