I can't offer a solution to this problem, but I will suggest forgetting about Beryl as it's essentially a dead project now - not worth troubleshooting at this point imho. If you must try it right now, I'd grab Compiz 0.5.0
instead, and the extras package linked in this Compiz ML post
also, for the ported Beryl plugins/additions that were in working order when that tarball was whipped up.
Alternatively, you can grab the current git version of Compiz, and the current 'CompComm' progress(though I'm not sure how easy the latter will be, I think the various plugins are still a bit scattered around - there are some handy scripts for grabbing/building on their site
I believe, but maybe they're on the mailing list, dunno) - I've read that there are some recent improvements and the current work-in-progress is running better than 0.5.0 (or at least it's got new stuff/enhancements and it's not horribly unstable).
The other alternative is to wait a while longer (months? hopefully not many) for the next actual release of Compiz that will feature 'Compiz Community' plugins/etc.
Everything is up in the air at the moment with these projects, but there ought to be some visible merge results soon enough.
sorry for not actually helping with your issue - the Beryl forum at http://www.opencompositing.org/
might have some insight for you. Or rather the Beryl junkies there might.