I've installed the 1.5.1 AppImage (I couldn't find a DEB despite a lot of hunting) and it mostly works OK apart from the fonts, some of which are missing from the Preferences menu page, and none of which are selectable there.
They're fine in 1.4.6 and the 1.5.3.svn.
All are pointing to the same .fonts directory but the Helvetica Nueus which are available in 1.4.6 & 1.5.3 aren't shown in 1.5.1 and no fonts at all are selectable.
I've attached screenshots from 1.5.1 & 1.5.3.
Has anybody come across this? I suspect it's an AppImage related issue but have no idea really.