At least, with the PluginMouse (Haven’t tested it with other types), PluginMouse.Button1Up will not fire whenever it is hovering over a Scrolling Frame[strike]GuiObject, such as a Frame[/strike], regardless of whether it’s Active or not.
Button1Down works perfectly fine, but Button1Up does not.
It’s a real pain to have to work with this, trying to make a draggable frame that only drags on the X axis.
(Edited): I am relying on scrolling frames for my animation editor plugin. If this bug, as well as this one does not get fixed, I am going to have to let everyone who I promised this plugin to down.
(Edit 1.5): I have found a similar bug with with Handles and ArcHandles.
When it’s inside of CroreGui, MouseLeave will not fire, while MouseEnter will.
(Edit 2): And while this isn’t being fixed, I’ll just, for now, make up a song.