Has anyone else noticed there's something pretty seriously wrong with the spin buttons in Inkscape? 

If you click more than a few times on either the up or down arrow the value goes nuts, and keeps going nuts until you switch to a different tool.

Here's a short video capture of the issue:
http://www.opendesignstudio.org/inkscape/Inkscape_spin_button_error.mp4

Any ideas?

This bug doesn't seem to affect any other programs (I tried Scribus, and GIMP, and both do not feature this bug).

I'm running Inkscape 0.91+devel r (Mar  8 2016).

This bug is also present in 0.91 stable.

-C