Forza 4: Cars Suddenly Missing?

Gang, I was playing around with the game yesterday, and I thought about building some cars for Laniford's 50's club racer series. I went to go buy them for my garage, and they were all missing from the game. MG, Austin Healey, and Triumph are totally gone. I had not downloaded any, but they would at least show up with the red DLC banner before. I cannot find them in the marketplace either. Has anyone had this happen? I did a Google search and did not see it.

Any thoughts?

I saw a few posts about it on the FM.net forums last week.

I didn't notice anything weird going on with my game though. I didnt really go shopping for DLC cars at all, I merely noticed the ones I already owned hadn't disappeared.