The fix is included in 2013.01 [Improve Context Sensing](https://spservices.codeplex.com/workitem/10136) but not in this release 2013.02a.
Comments: I am using SP2010 SP2, I get hit with this L_Menu_BaseUrl js error on each page visit. This is with SPS 2013.02a, and jQuery 1.10.1. Tried with IE8 and FireFox 25.0.1.