Hi, I have the same or a very similar problem. I have an experiment with a number of audio files. It seems to be running fine until the “please wait while resources are preloading” screen appears, then the next audio doesn’t play anymore and there is no way to continue (buttons aren’t loaded since the audio didn’t play). As far as I can tell, it’s not always the same item/audio, but I can’t say for certain. I’ve tried it on safari, chrome, firefox, restarted my computer and had other people try it on theirs, the problem persists. I’ve switched out the PennController.js file as recommended in the previous post.
Here is the (demo) link to the experiment: https://farm.pcibex.net/r/ulXBRK/
Thank you very much for your help!