Erratic problems with "save as" in CS6

Question

I have been having problems with the "save as" function in Photoshop CS6. Or, at least, the function is not working consistently with the way it worked in CS5 and earlier.
Specifically:
When I save an image with a new name, so as not to change the original image, the new file is saved, but the new name does not appear on the image tab. The name on the image tab remains the origninal, so that if I were to "save" more changes, they would overwrite the original image, not the new one. In CS5 and earlier, when you did a "save as", the name in the tab changed to the new name, and you continued editing the image you had just saved, not the original.
The file type on "save as" is always PSD, not JPG. If there is an option or preference to select the default save file type, I have not been able to find it.
I have reviewed the other threads in this forum about "save as" problems, and have confirmed that my plug-ins folder is empty and I do not have any alternate plug-ins folder specified in preferences. I did not move any plugins from earlier versions to this version.

Answer 1

> How are you saving the file (i.e., in what format)? 
I opened a JPG file, made minor changes (crop, levels) and clicked "File|Save As...". The dialog box came up with PSD, not JPG. I had to change it to JPG to save.
> Is the "As a Copy" checkbox checked?  If so, it will not consider the document name changed.
No. "As a copy" is not checked.
> If your file type is defaulting to PSD, that says you've done something to your file - ...
Yes, I am used to that behavior in earlier versions of Photoshop, which I have been using since version 4.
> I  suspect there's no problem here in PS CS6 (I certainly haven't detected one), but rather something
> you've done to your file is what's making work the way you're seeing it.
I did not add anything to the file. The only changes I made were cropping and levels. No adjustment layers were created, no channels changed, no change to bit level - I know how to do those things, have done so in the past in earlier versions, and am familiar with the behavior of PS when you do so. This is not that.
> FYI, I just tested this in PS CS5.
Version CS5 works fine. When I open the same images in CS5, make the same changes, and click "save as..." it acts exactly as I expect it to - it defaults to JPG and the file name on the tab changes.
This is a version CS6 issue, not something I'm doing, that I know of. I am not ruling out that there might be something I'm doing or in the setup which is causing the behavior, but given I am only doing very simple editing on these images and I have not changed the default CS6 Beta setup, I have no clue what that might be.
It is erratic, as I said in the header - sometimes the program reacts the way I expect, more often it does not and I get this problem.