Thanks Blue, dear lord this is looking like it's going to be version related; owing an apology to stahta01, & looks I could be eating my hat for dinner this evening
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It's possible that I may have edited the files on each build & run, thus changes were made each time & that would explain the issue. I've just tried setting compile & link to a different file, making changes to that file & seeing if that file was correctly updated to the build/ link paths - sadly it was not.
Sounds like I'm not using the IDE properly, so again my apologies there. I just can't picture a project for each & every tutorial; it's going to be a bit bloated I think, normal programmes have many files & I would think that through the course of development you'll turn them on and off to isolated changes & make it easier to debug; but you know a lot more than myself. Thank you for explaining the process to me & I see the logic in where I'm failing at the moment.