I've put together an improvement on chuggnut's fix for this bug found on the Shogun. Make a backup copy of your historical_events.txt file in the Data folder. Then go to my rudimentary page:

http://personalpages.tds.net/~mzimmer/

and save the historical_events.txt file that is the second thing on the list. Put that into the Data folder, replacing the original historical_events.txt file. That should allow you to play in 1.5 through 237BC and 167BC on both games started in an earlier version and in 1.5 (in chuggnut's version you had to switch back and forth depending on which kind of game you were playing). I tried it out and it allowed me to continue by 1.0 Carthage game that had stalled in 237BC, and it also allowed me to go through that date in by 1.5 Brutii game without any problems. So if you're experiencing the bug, try this out.