I used the symbols "&" and "ë" in the name of an identifier of a popup in the first sreen of a module. This caused a crash of the whole module (blank screen on View slide or View Module).

After renaming the identifier the module worked again (pfffff).  

That's interesting Chris, I assume it's an interpretation problem when special or extended symbols or characters are used.

The ampersand "&" you might expect to be a problem as it is used as a as a binary operator in programming languages, usually as the logical AND operator, and as the string or array concatenation operater. There probably isn't error trapping for this in the API but that won't be uncommon as Courselabs implmentation of the JS SCORM API is pretty standard off the shelf stuff.

The question is does it happen anywhere else where labels are used as identifiers??