Why does this script work okay in FM but not in IWP?

This is probably the most perplexing problem I've faced with FM recently; please refer to the attached .pdf of the script I'm having problems with.

The script belongs to a second-tier login screen and it works just fine when you're in the file using FM Pro. However, when a user connects to the same solution via IWP the script fails (apparently) at the IF statement "Get(AccountName)...". What happens is, even with the correct account name and password entered the script jumps to the ELSE part of that IF statement, which it shouldn't.

I checked the "Indicate Web compatibility" checkbox and the only instruction that is inoperative is the Freeze Window step. Other than that, it's a total mystery why the script isn't working the way it should.

Any ideas?

Ciao,

Rich

Login_Script.pdf