Hi @GUnderdown ,
Thank you for your interest in the NXP MIMXRT product, I would like to provide service for you.
I recommend you to verify from the following points:
1:I suggest you always create a new workspace when update the MCUXPresso IDE.
and import your projects, please do not continue using the older workspace.
2: I suggest you try to Clean the project, and rebuild it.


3: Please delete launch file, and debug again.

Wish it helps you.
If you still have question about it, please kindly let me know.
Best Regards
mayliu