Several players have reported this problem. This is not the same problem as has been reported in the past for earlier OFP versions.
These players have tried modifying OFP: Resistance's graphics and performance setting but to no avail. They tried removing all of their unofficial addons, campaigns and missions from OFP's folder but that didn't change anything.
What finally worked for these people was to delete file UserInfo.cfg in their OFP \Users\player_name subdirectory.