I'm using Daily 2012 DB v1.

In the middle of Vuelta 2013 I have noticed that suddenly division names came back to Cya Top Tour and race categroies to C.HC, T.HC etc. I have checked old saves and made sure that always Daily 2012 DB is chosen in game options (for some reason at each program startup it is changed back to official release even though Daily is my default DB - but this has never caused any problems).

I haven't noticed any other changes. All I did recently was changing some cyclist names - too many Ruiz Garcia's

Open your main PCM-folder and find PCM.daily Database Backup. Inside, there's a Local.cdb. Copy it to My Docs/PCM.

cheers, helped indeed :)

I hadn't noticed my game had done this as well, would it be because I had just started the second season of career?

Most of the time this happens when you start the game after installed a patch.