I use the Choice tool a lot in my courses, and my students get repeated errors. In a class of about 60 students, at least a third will get an error message when trying to select a choice. They select again, and some of them can try up 5 or 6 times before their choice is selected. In Ver 1.X this choice tool was fine, but since 2.X has had then problem. It's unlikely to be browser-related, as it occurs in Firefox, Chrome and IE.
If anyone has any guidance on this, please let me know.