Close S1
Duplicate .song as "Backup"
Close RVP app
Open S1
Go to Preferences > Advanced > Services
Turn off ARA
Restart S1
Open the session
Find the problem and/or remove RVP from all Events and/or disable RVP on all Events
Turn ARA on again
Repeat if still crashing
Bit of trial and error.
Obviously update RVP and S1 to latest version.
Update OS also !
God Bless ya !!!!