On Pop OS
!20.10
V0.3.1
I have three monitors that could be causing issues.
The inspector tab says the controls have a position and size but they all show up stuck in the top left with zero size.
Thanks,
Richard. 
Is server/micropython executable?
Yes.
I suspect it maybe my multi-monitor setup. Two of the monitors are in portrait mode. I’ve seen this kind for sizing bug a few times in other applications that assume the entire desktop canvas is on one monitor.
I had the same issue. Running the micropython file directly i got the following error:
error while loading shared libraries: libffi.so.6: cannot open shared object file: No such file or directory
Since I’m using Arch Linux, the currently installed version is newer. Fixed this by installing libffi6 via yay. Now the widgets seem to be rendered correctly.
Hope this will also solve your problem
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Good to know, thank you!
I had the same problem running Ubuntu 20.04.
libffi7 is installed on my computer. I created a symbolic link from libffi6 to libffi7.1.0, and now it seems to work fine.
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We are checking why there are so complicated dependencies. It should work out of the box.