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Created attachment 159567 [details] screenshot showing all the described issues After about a day work on a project, some files are no longer recognised from the editor as belonging to the project. As a result, functions from the corresponding classes are highlighted as "Unable to resolve identifiers" error. This is also visible on the filetab colouring (ignored files are no colour) and the function names are no longer interactive. However, the complete class in those files is visible in the Classes tab on the left-hand-side browser pane. One can refer to the image attached, all issues reported are visible. To reproduce the error I have created a new project from scratch, and replacing the newly created/added files with the files from the original project, after about a day it happened again.
Does it still reproducible in Dev builds? Do you have any exceptions in message.log? View->IDE Log