Game freezes/crashes [pic included]

[Flixton]

http://img184.imageshack.us/my.php?image=errorfc8.png

I get this error every 10-15 minutes, is it a known problem?
My game used to freeze earlier but after I upgraded my video card it's starting to crash instead.

[AdmiralTigerclaw]

User interface text formatter...

No characters (as in, letters, numbers, or symboles) can be placed on the lines. So appearantly, it's having trouble setting a font and format for a user interface.

Huh...

I wonder what could cause something like that. Just seems... weird.

[Flixton]

Help please.. The game crashes every 5 minute on larger cities 6,000 +