Did anyone find a fix for this? I'm also getting this problem. I think it happened when I installed the RH 11 trial (I'm currently using RH 9), but I'm not sure. I did find on this thread (Where does Robohelp 9 store its dictionary?) the location of the user additions to a dictionary, but I can't figure out what dictionary it's using for the base dictionary, nor how to resolve the issue of it randomly marking words as incorrect.
Here's a simple example of a topic where some words (template, templates, dimensions, mini-report) are shown as incorrect.
I tried setting my languages files to something else (like German) and then back to English. Still no go.