I don't know but generally installing ogg-support from extras repository (not extras-devel), so version 1.0.5 (not 1.0.7~rc1 or 1.0.6~rc6) is great idea, because it is stable. I don't know this also, but I think they updated both power kernel and ogg suport after enabling extras-devel and they solved it by either reinstalling version available in extras or the maintainer of package ogg support released new version which fixed this issue. I use power kernel from extras-devel (v47) with ogg support from extras (1.0.5) and everything is stable and I had not encountered any of these problems.