Illustrator or Photoshop "Unknown Error" when saving or can’t use type tool. Fixed!
No thanks to Adobe, even after numerous complaints going all the way back to Creative Suite 1, if you have a bad font on your system, you may have issues saving as an .ai in Illustrator. You’ll get the dreaded “an unknown error has occured”. If you disable PDF compatibility, it will save, but that’s not good enough! You may also have a problem in Photoshop, where whenever you try and type on the canvas, it says an unknown error has occured in the font rendering engine or something to that effect....