Reproduced with Inkscape 0.48+devel r9745 on OS X 10.5.8,
e.g. with 'U.S.-Web-Coated--SWOP--v2' ICC profile
IMHO similar to bug #166551 “color sliders don't loose focus on mouse up” the mouse focus seems get stuck within the color slider that was last dragged in the CMS tab (when using a CMYK ICC profile) and causes a change of the value on mouse-over with a subsequent collapse of the four color sliders and a change of the color profile back to <None>.
Reproduced with Inkscape 0.48+devel r9745 on OS X 10.5.8, Coated- -SWOP-- v2' ICC profile
e.g. with 'U.S.-Web-
IMHO similar to bug #166551 “color sliders don't loose focus on mouse up” the mouse focus seems get stuck within the color slider that was last dragged in the CMS tab (when using a CMYK ICC profile) and causes a change of the value on mouse-over with a subsequent collapse of the four color sliders and a change of the color profile back to <None>.