I think there's something wrong with my current clickbank account, so I want to create another account. Is that alright?
Yes you can, but don't put yourself in this corner. There is no something wrong with your account, it is something else.
I don't think tis a big deal. After all, they tell you its required you make another account should you forget your username since there's apparently no way that you can retrieve it. Just don't make TOO many at once and make it obvious, they may get skeptical and remove all of them. Rare, but possible so I hear.
It is ok to create as many accounts as you want. If you think your account has a problem why don't you email clickbank and ask?
you can create as many accounts as you want ... but it can be a pain waiting to be eligible for direct deposit again