Phew... Problem fixed. I'd experienced it for a few days, but thought it was only on mobile. It was also on desktop. The reason was due to Date().getMonth() returning a 0-based value, rather than 1-based, and January is 0, and Wraph simply wasn't built for a graph that ended in a zero month. Technically, the 'bug' would have fixed itself in February, but I figured, people will probably want it to work now... :P
The reason for the crash was that the whole script was caught in an infinite loop. It was totally unrelated to the jQuery version. (Yes, I'm aware that beta 3 is out, but I'd rather wait for the final release to be out, and the current beta is working just fine for me, so...)