Hello,
I spent forty minutes testing this extensively with 1.5.2 and ran into no issues. Tests were:
Failure, no CAS message, HDG to NAV
Failure, no CAS message, NAV to HDG to NAV
Failure, CAS message, HDG to NAV
Failure, CAS message, NAV to HDG to NAV
All of the above with new directs
Engine failure, HDG to NAV, HDG to APPR
Looking at your log it's definitely the Challenger crashing but it's just the same as last time. I will refer this back to the developer.