Languages not displaying in RoboHelp 11

We localize our documents in many different languages. When I was using RoboHelp 10, I had no problem opening the localized RoboHelp file and viewing it in that specific language. However, after updating to RoboHelp 11, the languages do not display correctly (all characters are just boxes). Any thoughts about how to fix this? All source files are the same, just opened in RH11 instead of RH10.