Why can't I post attachments?

I used to be able to attach pictures to my posts, now I can’t. I’ve gone and deleted some old attachments, makes no difference. What have I done wrong and when do I get out of jail?

In which forum were you trying to post an attachment? I’ll have to doublecheck, but I’m pretty certain that some forums (like news and offtopic) don’t allow attachments.

Oh that must be it then. Later on I was able to attach pictures. Thanks for explaining.