Does this explain why my site doesn’t show the ads anymore? When I check the sites, the space that an ad normally takes up is there, e.g. a square. There is just nothing there.
From what I understand it should not stop the ads being displayed. I should dig around in your AdSense account and see if there’s anything amiss. If not, check your code.
Ah well, if the account is suspended that would account for your ads not showing!
If there are no clues as to why it’s suspended and no way to re-activate it, you’ll need to contact Google. I doubt the account was suspended because of the ads.txt file.