I found a possible fix to:
MP: After Death Respawn/Revive - Unable to Enter Vehicles/AI does not react to you
Just found something that seems to have fixed. Only tested twice - Once with TeamSpeak running and once without
Entered server > entered Vechile > ejected > Left Base > Killed myself > respawned > entered vehicle successfully (normally it shows the animation of entering the vehicle but fades and then shows me back standing outside the vehicle)
This is what I did to fix:
Searching on google, came across a thread on United Operations site (wont post link as haven't read all the forum rules yet - pm me for it or if is ok'ed by an admin I'll post it).
They pointed me to this folder: C:\Users\username\AppData\Local\VirtualStore\Program Files\Bohemia Interactive
They advised to delete the "Bohemia Interactive" folder
I did not have this folder
But I did find "ArmA" folders in the %AppData% directory: "C:\Users\Kevin\AppData\Local\ArmA 2 OA"
I deleted this folder
When I reconnected to the server, it had to redownload the Mission file and BattleEye
Haven't had the error since - will post back after I get more game time in to see if this fix is permanent
If it comes back, I'll try to find the files in the %AppData% dir that's causing the issue.