6.1 aktion doesn't work well with the 6.1 version of xanim. aktion (using the 6.1 xanim) doesn't play .mov and .avi files that it would before, under 6.0 I fixed my 6.1 system by simply installing the 6.0 xamin package. This seemed to fix everything.
The proprietary codecs were taken out of the 6.1 xanim. You can download them from http://xanim.va.pubnix.com/, if you'd like.