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In the experiment tab, where it says click to edit, when you type in new text and press enter, the changes are not saved. It fails silently. Hitting TAB on the other hand changes the experiment name.
Thank you for the report! I filed a bug: https://github.com/smathot/OpenSesame/issues/79
When I get my hands on a Mac, I'll see if I can reproduce the issue and find the cause.
There's much bigger issues in the world, I know. But I first have to take care of the world I know.