After four months of playing this game and uncovering 2/3 of the map, I cannot save my game after leveling up to twenty. It is disappointing. I do have Broken Steel and DLC, tried bInvalidateOlderFiles=1, vanilla leveling no script mods other than companions. Patch up to date. I even tried the most popular nexus leveling mods. All saves fresh, never overwrite. With the exception of traveler mods and UF3P [up to date], largely vanilla, no overhauls. Could it be a conflict with Anchorage or missing karma titles? Is there a bug fix or work-around?

PC version, Win7, 64bit, C drive if that info is required. Thanks