Right, just tested it, and seems to work ok. I used this: http://sortitoutsi.net/forums/topic/3126/2013-adboard-patch because I'm on #FM13.
The instructions aren't exactly right in that link, but what you need to end up with is below. I can only assume that this will translate to FM14 but haven't tested it.
** Sports Interactive > Football Manager 2013 > ads > FM.XML
** Sports Interactive > Football Manager 2013 > graphics > pictures > ads > 8 REGION FOLDERS
The FM.xml file you want is either found in Club Adboards / No Club Adboards, your preference.
The 8 REGION