Just checked it then...there is no compatability set under the properties tab (and am running XP SP2)

I unchecked the auto-add box but then once I had the instances running nothing was getting passed between them. I re-enabled it and keys were passed once again.

I did see when I was running Vista that having windows explorer open on the root of a wow folder added it to the running instance list in keyclone...wonder if that could be the issue here, though I didn't see this issue under Vista when it was adding explorer to the list because its title was World of Warcraft. Will close windows explorer down and re-try it in a sec just to rule that out.

[EDIT]

Windows explorer being related to the problem has been confirmed to not have any effect. I closed it down, used keyclone to connect to account1 linked to region1 and it opened up fullscreen region0, I closed it and re-opened and it went to region1 as expected.