Thanks a lot. That really helped. While all the other discussions here are about avoiding IO calls, it's the only solution for javascript :)

I still don't understand what was going on, I don't think the string length was the problem (http://stackoverflow.com/questions/5926263/javascript-object-max-size-limit#answer-5926426).

btw I also experience regularly the issue with getting different responses for the same code. I already wrote support, seems to be a JS problem...