I left the crew I was in, but I still have its crew menu, for this reason I can't create my own crew. Is this a bug?
I left the crew, but I am still "in"
You shouldn't be able to see old crew anymore!
About the reason why you can't create a crew... it has nothing to do with forums!
Can you explain step by step what you're doing and provide us screenshots of the error you get when you're 'denied' to create the crew?
Everything seems to be ok now, I logged out and then logged in, so no problems anymore : )