Thanks for your patience with this - it's still a bit mysterious as I haven't been able to reproduce the issue my end. I suspect it's a font thing though from the screenshot so I've gone ahead and bundled the fonts with the app on Linux builds in case it's your system's font lookup. I'm hopeful but not certain this will fix it. I'd be super grateful if you could try the latest build (0.5.19) and let me know!
Thanks again for the detailed reports so far.
