I think it sometimes depends on the font too... the more complicated it looks, the more issues you might have. for instance I noticed that it sometimes has issues if you have any letters that have seperated parts like i or ; : or various special language letters. it was reading each part as a different character & I ended up having to add a faint line between each part i in photoshop.
I wish we had support to use actual font files instead of these text map things. would make things so much easier; plus it might allow for setting size, colors, bold, italic etc. would be nice.
good luck with fixing your text