I was trying to save a preset in Vienna Instruments Pro standalone and it would not allow me to write a "c" in the name! Also some odd ignoring of other letters, then suddenly putting them in as I typed. I thought my computer (typing) keyboard must have a malfunction, so replaced it with another I had. Same thing. I then tried to save a new-named preset on another computer running VI Pro and the same thing happened. This looks like a glitch in naming new presets.
The reason I was saving them in VI Pro STandalone was to use the replace instruments shortcut with Dimension strings, but this had nothing to do with the other computer which behaved the same.