I think I'm having the same issues as described here: Lyx on Mac inputs diacritical marks instead of punctuation marks
When I try to type a colon, for instance, I need to hit "shift+colon key+colon key" instead of just "shift+colon key". Not only that (and this is why I'm not satisfied with the solution of the previous thread), when I do that, the next letter I type is decorated by some kind of a diacritic...
Also, when I type I get this small ">" sign next to the caret, I'm not sure if this means anything.
Did anyone encounter this phenomenon?