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When it takes you back, I assume that MG5aMC asks you again which cards you want to edit. Can you press 2 (the run card) and verify whether the lines that need to be changed have been changed? If this is the case, then you should just press enter to validate everything and move forward.

If the run card has in contrast not been updated, then there is something weird. What you can do is to save your file with :wq!. The question mark will force it to obey. I don't understand why the swp file is not automatically deleted.

Please let me know first about everything above. Then we will see how to move further (I have options in mind).

What needs to be changed has actually been changed. When I typed :wq and press entered, I didn't expect it to take me back to selecting a card for editing again. At least, that's now the way it is in your own screenshot.

Then you can press enter and move on. This means that you are happy with the cards as they are, and that MG5aMC can proceed with the simulations. Does it work?

This is what I get when I pressed enter
image.png

This looks good. You can save the file (press :wq in VIM) and move forward. Does it work?

I was taken back here and when I press 2 to run-car, the cycle continues
image.png

If you press 2, you tell the code that you want to edit the run card again (and therefore the loop). When you are happy with all the cards, it suffices to simply press enter without anything else. Can you please try?

I'm off the pc until tomorrow. Will try again and let you know how it goes.