When setting up a fresh system using another computer's USE config, I noticed that kde-base/konqueror-4.2.1-r1[thumbnail] and media-video/mplayerthumbs-1.2[kdeprefix] form a circular dependency. This problem is (most probably) not noticeable if Konqueror is installed without the thumbnail flag first. Reproducible: Always
Fixed in 4.2.2
rigth :] closing