Hello fellow racers / artists 
For over a week now I have been unable to share any of my vinyls or designs on Forza 5. I get two messages either “please try again later” or “you’ve specified something that has been blocked by the language filter”? Even when I don’t enter any text? Has anyone else had this trouble?
I can only help with the please try again later. FM5 seems to be very easily put out by not naming your files. This is what I’ve found helps to get around that. Get in the car and load the design you want to share. Go to “add remove decals”. apply any decal. Then cut that decal off. Back out of that screen. At the prompt choose “save to design catalog only” give the file a unique name. Do not let forza do it for you. Then you should get the share prompt and it should work with not issues. Then go back into designs load the new version of the design and then delete the old corrupt file.
As far as the language filter, that’s from XBOX itself and you need to your question over there.