Running Linux Debian 12/bookworm (branch testing), I just run the installation of Avogadro 1.96.0 as provided from the OS repositories via synaptic; same result (analysis → create surfaces is void).
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When presenting the current AppImages (reference), Geoff pointed to a public GitHub repository. If you have command of C++ (right hand side, section languages), perhaps you spot the road block.
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In case your aim is a quick computation of van der Waals surface, or to display molecular electrostatic potential (which is my current goal), let the maintainers have all the time they need; for now, I resort to Jmol as an alternative/bypass.
The .gif below provides some impression (but in post production was reduced to 64 colours and low resolution to pass through the size limit in this forum, 4MB per file.)
