Seems this most likely to appear when playing on a laptop.
TO FIX:
Go to your Thera.cfg in your Thera mod folder.
Change the lines:
## run game in windowed mode
windowed 1
to
## run game in windowed mode
windowed 0
and
borderless_window = 1
to
borderless_window = 0
save the file and play.
MAJOR_BASTARD_
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