I updated my v4l-32bit and updated my libxcb-32bit to the latest versions from the packman repo and the Xorg repo. This seems to have resolved the issue.
I’ve also turned off desktop effects temporarily, but I don’t think that actually has anything to do with it.
thanks! I added the xorg repo (packman was already in the sources) and ge loaded, if slowly - had to deactivate composition, though, since the ATI driver cannot cope with boht, and ge’s 3d rendition flickers horribly if composite is on