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This isn't a Pmw issue. I just built Python 2.2.2 with Tcl/Tk 8.4.1 and Python 2.3 with the same Tcl/Tk. This code:

import Tkinter
a = Tkinter.Frame()['borderwidth']
print type(a)

produces these results:

On python 2.2.2: 
        <type 'str'>

On python 2.3:
        <type 'int'>

So, there you have it. Python 2.3a2's tkinter isn't backwards compatable with 2.2.

I don't know if that's a problem or not. It's just an observation I came across while porting some older python code (which used Pmw) to 2.3.

Hope that helps!