I've no idea. Just some thoughts though.
Does it behave the same no matter where you open it from, i.e. from a desktop shortcut or the Windows menu etc?
When you say slither, is there anything useful in the slither i.e. is it a taskbar or list or anything identifiable?
Can you highlight the slither, if so try pressing F11.
Does it have an edge that you can hover over and see a resizing arrow, where you drag it open? (Maybe that's what you're trying on your latest post)
Do you remember anything odd happening which may have caused it?
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