I had a website customer contact me this evening regarding an issue with switching from old to new webervations so I'll pass along what I know so far for the benefit of anyone going through the switch.
The problem with switching from the older version to the newer version is that the address that gets you to the newer version is different, so you have to change the links to your reservations / book now / request reservation or whatever you call it on your site. That part is no big deal. The bigger problem is that you have to go to every directory you are listed with and check to see if they have a make reservation link and make sure it is also changed to the new system...then after it gets changed you have to verify that it works.
Right now there seems to be a problem with bbonline's implimentation
(though I'm not sure where the fault lies, could be the owner, webervations, or bbonline, or some combination - I should know more later) My client changed the link in their bbonline account to point to the new location, so the direct link works fine. However if you use bbonline's availability search and search for a specific date to stay, when the list of available rooms is returned, the "Book Now!" links points to the old version of webervations and generates an error if you click on it (if your webervations is now using the new system)
If you have switched to the newer version of webervations and you have a bbonline listing, you should double check that all your reservation system links are pointing the right spot and function correctly.
Ultimately I think that Webervations should adjust there system so that if you are updated to the new system, all old links to the old system will get forwarded automatically..