See the comments in the release notes for 2-4-9
http://webwork.maa.org/wiki/Release_notes_for_WeBWorK_2.4.9
in the "Gotchya's" section.
It turns out that Safe 2.29 fixes many of the issues with Safe 2.27 but not all of them, so for now we are distributing an old version of Safe with WeBWorK.
$ svn co http://svn.webwork.maa.org/system/trunk/webwork2 $ svn co http://svn.webwork.maa.org/system/trunk/pg will get the 2-4-9 version at the moment. You can also use $ svn co http://svn.webwork.maa.org/system/tags/rel-2-4-9-beta/webwork2 for a snapshot of the trunk as of December 2 which is virtually the same. The rel-2-4-9 tag will be created shortly when the splash pages are ready for the new release. -- Mike