Basecamp deleting old files on import of new ones

Hi all

Has anyone noticed that Basecamp for Mac seems to delete your previous most recently imported file when you import a new one? I find this really, really annoying because sometimes you don't realise its happened until you go to find a previously imported file and its not there.

What I mean in detail is, if you import a file using "File -> Import into xxxxx" it appears in your My Collection - all good there! However, when you import another file, the one you previously imported disappears. The way around this appears to be to remember to duplicate your file before you import a new one so Basecamp deletes the duplicate rather than the original.

It took me ages to realise what was going on with this, I thought I was going mad! Am I?

Cheers all