I installed 1.4 RC1 on a HP ProDesk 600 G2 SFF i7-6700
Every character that I type in is only chown as small rectangle. The same with leafpad.
Firefox is fine.
I think that I have some problems with fonts, but it is hard to analyse this because I only see this small rectangles .
I guess, for some reason, the installation was not completed. Was there an error message? Have you checked the content of /usr/local/share/fonts? Its size (du -h /usr/local/share/fonts) should be about 199MB. Is that the case?