Invisible main menu text and ATC window text solution

After I installed a couple of addons, I found on my next flight, the main menu was working but had no text, same for the ATC Window. A quick Google, showed me that this was a common problem and the solution that worked for me was to copy the Verdana font from c:\windows\fonts to d:\steam\steamapps\common\fsx\fonts and restart FSX. I guess an addon installer had changed the font to Verdana, a bizarre bug that has obviously been there a while now.