Update: This issue seems to be related to the linked ICC profile (or its version?):
Tests in Inkscape 0.48+devel r9828 (lcms 1.19) on OS X 10.5.8 e.g. with two different Fogra27 profiles:
1) Coated FOGRA27 (ISO 12647-2:2004) - download from Adobe.com - CMS color sliders behave erratically and do not allow changes
2) Fogra27L CMYK Coated Press - downloaded from lp:ubuntu/icc-profiles - CMS color slides work as expected and the profile stays selected
Update: This issue seems to be related to the linked ICC profile (or its version?):
Tests in Inkscape 0.48+devel r9828 (lcms 1.19) on OS X 10.5.8 e.g. with two different Fogra27 profiles:
1) Coated FOGRA27 (ISO 12647-2:2004)
- download from Adobe.com
- CMS color sliders behave erratically and do not allow changes
2) Fogra27L CMYK Coated Press
- downloaded from lp:ubuntu/icc-profiles
- CMS color slides work as expected and the profile stays selected