Pavlovia experiments used to work, now blank screen

That’s strange; in the code I see PsychoJS 2021.1 being imported, but that version of the library doesn’t exists (all 2021 versions have the from 2021.1.x). My guess is that the steps below would solve your problem:

  1. Delete the project from Pavlovia gitlab
  2. In your psyexp file, Settings, basic tab, at Use PsychoPy version: pick the empty option
  3. In your psyexp file, Settings, basic tab, at Output Path: leave this empty (no html).
  4. Sync again