I just found and (I believe) fixed a race condition in SparseGrid2D, SparseGrid3D, Continuous2D, and Continuous3D which can cause certain methods to perform incorrectly when using multiple threads. If your code is single-threaded (you're not using ParallelSequence), or you're not using the methods listed below, there's no problem.
Affected Sparse Grid methods: getObjectsAtLocation, numObjectsAtLocation, removeObjectsAtLocation
Affected Continuous methods: getNearestNeighbors
If you just want the updated jar file, you can get it here: