I'm not sure if this is just me, but my Window > Style settings have reverted back to the original (or some other configuration?). Also, changing the font size does not seem to work anymore.
Based on your previous error message it seems like your font file cannot be located for some reason. This might explain why changing the font size has no effect.
Are you able to read/write to the folder %APPDATA%\remedybg? If not, then then the default settings would be used as you are seeing.
If you are indeed having problems with the default settings directory, again %APPDATA%\remedybg, you could specify the folder to the settings directory on the command line using
remedybg --settings C:\your\settings\folder
though that shouldn't be necessary, normally.