I noticed that the entire project name doesn’t show up at the top of the program window. See pics. 
It seems to work as expected for me.
It could be that something somewhere is elimination the last little bit of the file – thinking that it’s the file extension – but that seems really really unlikely.
So, I’m guessing that there’s something non-obvious going on here.
I would open the Get Info window in the finder and look at the full name of the file with the file-extension.
My guesses:
- Maybe the extension has accidentally been eliminated?
- Or maybe the file that you have open is not actually the file that you’ve taken a screenshot of?
Isaiah
Unchecking “Hide Extension” fixed it. Very odd bug. I have never noticed this before. Thanks Isaiah 
very interesting. if you re-hide the extension does the bug re-appear?
i still can’t make that happen, even with hidden extensions.
but maybe it’s worth telling @dan to go investigate the code a bit further. see if there really is some type of bug in there.
Will look into this, probably something to do with RW (or the Mac?) thinking the extension is .3 instead of rw8.
Very odd.
If I re-check Hide it no longer shows correctly in RW. It seems RW is not seeing the extension correctly when it is hidden.
I’ve noticed this happening a long time ago and I just stopped using periods in file names. Instead of TLC 1.1.3 I would name it TLC 113.
… or if you put the dot behind the last character it works, too.
So, looks like this: TLC 1.1.3.
just to complete: