I recently tried to switch to version 1.4.5 but have encountered some serious issues with my models made in version 1.3

Max FPS controls movement speed now? When I loaded my model it was moving incredibly slow, and eventually I figured out that changing the max FPS changes the actual movement speed of the model. Also frame animations are running like twice as fast.

Bounce now imparts insane amplitude, especially on rotation. What was a gentle bounce in 1.3 now makes rotating elements spin wildly.

For convenience I have documented the issues. This is the exact same model with all the same settings.