Don't be a lagopus!
See the website here-
There may be issues with the cairo drawing functions used by alopex and some nvidia drivers. Unfortunately I have no way of tracking down this issue. If you have a nvidia card, either 1) use the FOSS drivers, 2) use another WM, and/or 3) help pinpoint if and where the issue lies between cairo and nvidia and report it to their devs.
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There is a known bug with gtk3 windows not being drawn. This is next on my chopping block and a fix can be expected soon.