As much as I like the plane, I am so frustrated by the FMS freezes (same as it happens with the A320 of Inibuilds) that I will not use it anymore, until it is finally confirmed as bug with fix incoming!
Had to abandon several flights now. Just again after spending 10min on ground entering my flightplan, it froze after deleting a discontinuity… 
Also see thread:
A400 FMS screen freezes permanently when deleting discontinuity - Bug Reporting Hub / Aircraft & Systems - Microsoft Flight Simulator Forums