I've discovered that the '{whatever}.fbm' folder containing the PNGs isn't something that I downloaded - it's created and populated by Poser when it imports a '{whatever}.fbx' file. So that explains why my resaved PNGs were overwritten with the blue-tinted ones.

ironsoul -seems to confirm that somehow the alpha channel is at the root of (or at least heavily involved with) this.

Vaskania - It doesn't say much on the download page and there's no readme, but the model's quite low-poly and is probably intended for games. But the alpha channel shows as a single flat color - black in GIMP, white in Irfanview.

I've tried shifting channels by one in GIMP (i.e. R->G, G->B, white/black->R, also B->G, G->R, white/black->B) and I get a similar sort of tinting, but definitely not the same. But I get the feeling ironsoul's on the right track - it's something to do with the wrong channels being read into the R,G,B slots from a PNG with an alpha channel.

(Come to think of it, I recall Poser having problems with PNGs from way back, Poser 9, maybe 6 ?)

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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).