I have the same problem though I may have a workaround for you. The first city I made starts alright, I load this up and choose the region view button on the bottom left side of the screen and start another city from here. After starting new cities this way you can then load them the normal way going forward. Not a perfect way to do it but it seems to work for me. See how you go!
OMG, how can i ever thank you?
why does EA not have this in their FAQ?!?
I have been stuck with this city not loading problem for over a year!
Thanks again, and to clarify for anyone who has this problem where the game only allows you to play a single NEW city in regions, and when you try to open another city it simply won't load - simply go into region view, select the new city you want to claim, and press claim.
