Here is the fix.
Open the 1756 Montcalm file in the Events folder.
Do a word search for this line:
SelectFaction = $FRA
StartEvent = evt_nam_FortCarillon|1|1|NULL|NULL|NULL|NULL
Replace the second from last NULL with $Crown Point.
Line should look like this:
SelectFaction = $FRA
StartEvent = evt_nam_FortCarillon|1|1|NULL|NULL|$Crown Point|NULL
Save the events file.
Should work now. The fix can be introduced into a PBEM game prior to Oct 1756 and still work.