Are you running multiple versions of LFS? I would punt for having some of your settings different in each version. Make sure your analogue steering smooth is set to Zero in both version. I reckon in one you have it at zero and in the test patch it's reset to something else. Go through all your settings in the earlier patch and mirror in the new one. Plus, is the profiler set up for 'generic' settings or game specifics. It may not recognise the new LFS patch, thus reverting back to basic settings. Set the profiler to generic.