Hi @alan.parkinson,
The team have been investigating an issue that relates to the reliability of serving all.js - see Apps fail to load due to timeouts and ACJS-1134.
As part of this investigation, a configuration change was made but rolled back. It is believed that this change could have caused the TypeError issue you reported. If you are continuing to see this issue, please report back. Otherwise we can attribute the problem to the configuration change that was in production briefly.
Regards,
Dugald