Online experiment hangs midway through

URL of experiment: V1.2_shorttest_JS [PsychoPy]

Description of the problem:
I collected data successfully with the above URL earlier this year and now want to do a 2nd wave of data collection. Upon testing it, I noticed that it now hangs in the 2nd phase, hallway through the experiment, on exactly the same spot each time.
Nothing has changed, it is the same version I used before.
There are no error messages, and it works fine locally so I cannot discern what the problem is.

The experiment has 2 phases, the 1st of which involves participants judging the variability of visual stimuli (6 blocks with 20 trials each;, they judge variation in angle, size, and width, with 2 different variabilities for each type of stimulus)
The 2nd phase has them judging the variability of temporal intervals, either between 2 observed events or between an action and an event, again 6 blocks of 20 trials each, with 3 degrees of variability for each type of interval).

Any ideas what might be going on?

I just got all the way through (Windows/Chrome). Try Ctrl-Shift-R to flush the cache or an incognito tab. Maybe you’ve got an old version saved in your cache.

Thanks @wakecarter. Very strange, I just tried that and incognito window in Mac/Chrome and it hangs at the same place each time…