Hey gang -
Chiming in here as well - since the update to KSP 1.4.3, not only am I seeing the weird '90 degree twist' when docking, as described by others, but also, none of my ships, which used to get to orbit super-efficiently pre-1.4.3, can now do so. Using Ascent Guidance's autopilot now results in rockets making it to about 44 to 48 kilometers up, and then willfully steering back down into the atmosphere. The entire time, MechJeb sits on 'Gravity Turn,' regardless of the ascent profile selected, and never advances. For craft that actually do get to an orbit, desired altitude is never respected by the program.
This happens constantly and repeatably. Can anyone help?