Hi @Karen, no problem, code I wrote to allow for parsing array looking strings and which got recently pulled in to PsychoJS is using a JS String prototype method called matchAll that is unavailable in Safari 12, because I looked at the browser compatibility table and lazily decided Safari 13 support should be good enough. The issue has come up before. I now need to revisit that utility function and make tweaks to allow for the code to run on Safari 12 and other legacy browsers. I’m hoping to have a fix ready in the next few days, many thanks for your patience, x