Broken locks on drafts?

So I'm a designer, I've been using dreamweaver for a long time, it works great, I love it. So I have a client that I want to set up with contribute, and I've never used it myself so I figured I'd try it out.

I went to my own website, enabled contribute for the site in dreamweaver, and connected successfully to the site within contribute. I can load a page, and click the "edit" button to make changes. So I make a change, and then it was my understanding that you click the publish button to upload the change back to the server and you're set.

Oh, but wait, I get this message:

"You can't perform this action on this draft. The draft is invalid because a lock has been broken and another instance might have already acted on the draft. Contribute will remove this invalid draft from your machine."

WTF????

So then I click OK, and a save dialog box comes up which will save the web page to my hard drive.

So then I have the edit button again. Let's say I click the edit button, I get this message,

"Another Instance of Contribute is doing a workflow operation. Do you want to break the workflow lock and continue? Doing so might cause draft corruption if another isntance is still performing the workflow action."

No clue what this means.

Please help, I just want this to work!