AP Posting

Is anyone else having trouble posting to AP? The invoices and bank drafts used to pay them are visible in the AP module, but when I post, I get a message that there is nothing to post.

For the past month we were not able to post cash receipts in NXT, but had to post them in database view. Then, yesterday, database view crashed and we couldn't enter them at all. This morning, that issue has been resolved, but now I am having this issue with posting to AP. It should not be a novelty to have your accounting system work the way it's supposed to.