Well I'm the newest victim of the tampered profile problem.
I wrote to microsoft via e-mail as I was advised to do by a mod before he locked the thread Id made asking if this was fixable, due to users flaming Turn 10 big time anyway they replied which was nice and seemed to genuinely feel for me.. although it does not make me feel any better.
As instructed here is exactly what happened before the dredded profile tamper screen
PLEASE NOTE I HAVE NO MEMORY CARDS OR ANY MEMORY BACK UPS AND HAVE NEVER EVER CHEATED
Okay last night I was racing online without problems I also had a 12 hour auction running which finished early hours this morning, this being a Ferrari Enzo with my Starbuck self made design
was in a online lobby choosing a car to race in class A but as I flipped through the garage I got the common freeze up, so no option but to switch off console which I've done maybe 20 times before
Switched back on and searched for a race, got in went to choose car same thing again, at which point I gave up turned power off and went to bed.
Woke up this morning saw via the website by Ferrari had sold via BUY OUT so went and turned Xbox on to collect credits.
However upon loading my profile it took like 3 minutes to load (red screen with forza background with saving game etc at the bottom) then it at last loaded, went to AH but car not there, powered down and rebooted, 3-4 minutes again loading (normally takes 15 seconds) it was so bad I thought it had frozen, this time I got to AH my Ferrari was there lit up green as it was sold.
I then attempted to collect money, it thought about it for a bit then said my profile had been tampered with, tried a few times but same thing every time.
Tried to bid on stuff? same thing.. tried to list another car?? same thing
I don't need to go into detail but VERY UNHAPPY and I refuse to start again, I've completed career at level 50 and 93% complete in arcade, have a fair few million of hard earned credits
In regards to the banned from auction guys, think yourself lucky that sorts itself out with zero long term problems, I've had it 4-5 times now
THIS IS THE SERIOUS PROBLEM