Unfortunately no, we've tried a few ways to work around it.  Since our situation only requires two different symbols, we've tried two layers, with definition queries instead of a single layer with category based symbols but it doesn't work very well.   The bug states it is fixed in the current build.  Although I don't understand what that means.  I re-downloaded mobile 10.1.1 thinking they might have fixed it, without incrementing the build numbers but it still doesn't work.  I should mention that we have been able to get this working with line features stored in a 10.0 geodatabase.   Andrew