The git repositories are updated every night (MET). Bootstrap has changed its preferred CDN from netdna.bootstrapcdn.com to maxcdn.bootstrapcdn.com (see [1]). If one has an installation older than this change, this is probably the problem. I'll try to make an update script for this.
Concerning gravatar: if you have the version from github, this should be fine (see [2]). However, if you one is doing an "install from repository", one gets the "last released" version of the branch (with an appropriate tag). So far, i think nobody has released any version depending on CSPs to the release channels. The mixed version might explain the problems.
all the best
-gn
[1] http://cvs.openacs.org/changelog/OpenACS?cs=oacs-5-9%3Agustafn%3A20160912114338
[2] http://cvs.openacs.org/browse/OpenACS/openacs-4/packages/openacs-bootstrap3-theme/resources/widgets/login.tcl?r=1.1.2.2#to22