@otto42 Version 4.3.3 is missing "css" directory, though dev version has it.
Perhaps you might consider bumping the plugin version so that users installing via the Dashboard will install a 4.3.3.1 (or a 4.3.4) and won't simply re-install 4.3.3 which is still missing files?
Seems like the missing files is what's motivating most of these forum posts today.