Presets revert to wrong values on Save (no replies)

I'm having a problem with Slic3r, when I try to enter new values for things like "Bed Temp", "Perimeters (minimum)", "Solid Layers (top/bottom)", etc. The preset I have will say, perhaps, "1 perimeter", and I want to change it to "3". So I enter "3" and hit save. As soon as it finishes saving, it erases the value I put, and reverts back to the "1" it had originally.

Any ideas?