[Inkscape-user] Pasting bitmaps from other programs

I just tried something I'm pretty confident I did in the past: I pasted a bitmaps from another program (Irfan View, and later Photoshop) into Inkscape. It was a small bitmap - 24x24 pixels. But no matter what I did it appeared with a size of 11.81x11.81 pixels. Is this a bug or am I doing something wrong? I tired fiddling with the bitmap preferences in inkscape, and also changing the image resolution to 90 px/inch on the programs I copied from, but nothing helped. I'm using Inkscape 0.48+devel r12395.