Error "We are currently performing.." when not logged in

Error is showing "We are currently performing some scheduled maintenance.
We will be back as soon as possible. Please check back soon."
http://www.aerialliftequipment.com/av/

It goes away once I log in as admin in a separate browser tab. Both in Chrome and IE

Please advise.

sounds like your site is in in Maintenance Mode. Go to System - Settings - your site and then the Server Tab. Change maint mode to No, hit save.

Yes, it worked. I actually reported this issue in the bug tracker and got the same reply form developers. Apparently, they are going to fix this bug in the 2.1 release
Thanks for the heads up.