I have an issue with the compile of a long running project which is now showing the error indicated above. The issue arises from a specific component which is in herrited from TCombobox. If I place the component in on a blank form with no other controls the project will compile and run. I then save the project and re-open then re-compile the project will give the error. The only solution is to remove the component and put it back in which then allows the project to compile and run until it is closed and re-opened again.
I am currently upgrading from XE4 to 10 Seattle and have two identical copies of the full project code and the error is occuring in both.
Any ideas would be most appreciated