...If I select one of the Image_Map bricks which have an image (i.e. 4, 7 or 11) and set Image_Source to None, then although the text for Image_Source is correct (i.e. 'None') the preview image (and the image used when you actually render) appears to be a random one (as far as I can tell it's always a random one from the images currently/already used in the current shader on the current material during the current session, but I wouldn't swear to that. (I'd guess the root cause is possibly that a pointer's getting screwed up in the code somewhere?)

Q1: Has anybody else seen this problem?

Q2: Is this a known bug in Poser 6 that's already been fixed for a later version?

Q3: Is there a way to fix/work around the problem (I currently delete the brick and add a new one).

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).