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This happens when I choose Close All from the menu.
If you have turned off the option:
Tools > Options > User Interface > Form Designer > "Embedded Designer"
Then turn it back on. When not embedded I was getting an access violation in vcl270.bpl whenever closing a project.
This is not true... I've never turned it off and TURD studio always gives vcl270 access violations....I don't event have to close a project just the main form of the project. 10.4 is better in some ways but seems like it was rushed just to show off the shiny new LSP code insight which is marginally better. Pick any version of visual studio and it runs circles around RAD studio for stability, usability, features that actually work, productivity, and any other metric