Are you using the ThinkGeo UI OpenStreetMapLayer in your application and experiencing problems with map tiles not loading? This may be due to recent changes on OpenStreetMap’s side in which they are more strictly enforcing their Tile Usage Policy. This policy requires (among other things) that any application consuming tiles from OpenStreetMap’s servers must identify itself with a valid HTTP User-Agent. By default, ThinkGeo’s OpenStreetMapLayer does not specify a User-Agent, but you can (and should) set one yourself.