Sounds to me as though there is a strong possiblity that you may have been hacked.
Get into your listing and change your password and take your listing back.
Change every passcode you have while you are at it and set up a 2 factor authentication.
Check all email adresses and bookings the scammer may have diverted to them.
I believe you can call CS for assistance, but do expect them to likely shut down your listing while they investigate and sort it out.
moosebigd, yea, this has happened before. It's a glitch in the system. Happened to me a few nights ago, and also several years ago, though I cannot replicate it now. Call CS, but Doubtful it's a hacking, so don't have them panic and shut you down.
It's just one more wonky thing with VRBO.
Follow up: I called CS and had a very good experience with the rep. He was not aware of any other owners having these issues. After surveying our listing, he assured me that there was no unusual activity in our account and did not believe our listing was compromised. As preventive measures, he walked me through changing our password and advised me to clear my cache and cookies on all our personal computers. He was unable to offer a reason for a random name to appear on log in.
Your CS agent may not have known, but I raised this exact issue last week and again earlier this week with an escalated CS agent and even provided a screen shot of "Tim H" showing as the login on my dashboard.
The only issues they suggested were: I must be using a public computer shared with someone named Tim (no), clear my cache and cookies (which I do regularly as I'm working on my website so I know that wasn't the issue) or perhaps a hack.
They did not mention that this was an issue shared with other owners. What a relief to hear it is only yet another glitch. (insert eyeroll)