VST, Windows 8, FL Studio
When I drag one of FL Studio's windows over my plugin's interface and then drag it back off, it leaves multiple copies of the interface's GUI, stacked up on top of eachother. The sliders, dropboxes, etc aren't movable in these copies so it seems like a graphic glitch. In the attached pic check out the right side of the plugin. That happens when I drag the little window to the right of the plugin over the plugin.