Hi There,
For your first error:
“One was when giving them the link, the user brought it up on Safari, and they got an error. It was something to do with missing sound I believe, despite have no sound stimuli in the pilot study.”
I am guessing this was something to do with “Tone” am I right? it is most likely this is originating from a code component somewhere, but in general we recommend avoiding safari if you can ask your participants to do so, because it is a less reliable browser for experiments.
For your unspecified Javascript error there is a little fiddly fix but it should do the trick. Help with new 'Unspecified JavaScript Error' - #2 by Becca
For your last issue with the CSV it sounds like you may have shared a pilot URL instead of a running URL. be sure to switch your experiment mode from pilot to running so that you can share with participants 
Hope this helps,
Becca