I can see the data thru ms project view and csv (read: I know it's in there) but the flag that marks it a disabled item is doesn't seem to want to unflag. I tried to removed the file from the list of disabled files (re-enable the file) by clicking the File tab, clicking Options, and then clicking Add-Ins. In the Manage list, click the arrow and select Disabled Items, click Go, and then select the disabled item. Etc and without success.

Open Project (not the file)
Set the calculation option to manual (turn off Calculate after each edit)
Insert the project file but do not link.
You may be able to salvage it.

If not - it's time to revert to a backup copy.