The following bugs were addressed in 4.1.1:
1690: OpenCL performance in release 4.1
1693: GCC 4.6 gets an error compiling the Python API
SimTK is maintained through Grant R01 GM107340 from the National Institutes of Health (NIH). It was initially developed as part of the Simbios project funded by the NIH as part of the NIH Roadmap for Medical Research, Grant U54 GM072970.