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It works properly for me. The "A" button accepts whatever has been entered in the virtual keyboard as the filename (and path).
On my player, the virtual keyboard goes away and returns me to the previous screen. I can verify that files are saved to the right place. Does the A button work for its other functions (e.g. return to WPS screen if away, or play/pause if on WPS)?
I have just verified that it works as usual for me with r18891. If our build and hardware are the same (you didn't mention which revision) then we should find some other factor that's unique to your situation. First, try clearing your settings and see if your situation changes.
The power button should exit without saving changes.
What version number does yours report now? And does the power button work normally in other screens?
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