This happened to me after upgrading from TeanViewer version 9.0.4110 to version 10.x.
The TeamViewer support claimed it should not happen...
I restored version 9.0.4110 and the error no longer appeared.
I still use this same version.
I had to re-install CC 2015.4, basically because cc 2017 SUCKED!!! and it worked fine for about 2 weeks, but now I'm also getting that invalid font error, only it lists every font on my PC, not just one or two. But they all show up in the Title window.