[Asking the question made me realise what was wrong - but leaving it for others] URL of experiment: Dagmar Fraser / Hickman_Shapes_V4 · GitLab
Description of the problem: Trialing the above. During testing I have been using a time out 20 seconds and the mouse XY position is saved faithfully. e.g. Mouse X is 20 * 60 long in one cell when opened in Excel.
When doing 90 seconds (so 90 x 60Hz) we get the csv with data escaping the cell when opened in Excel… and that’s the issue Excel wasn’t parsing the CSV correctly. Opening it is a text editior showed no issues, and so we opened it in Numbers on the Mac and it parsed correctly. Sigh.