Hey Brian...
I turned off all the various Rok modules, except the login, and moved the Dogear module to the left position... Guess what? It works

Now that I know it works I can have a play with positioning... I've got a bit of of experience with creating templates from scratch, so I'm sure I can modify the Replicant template to suit...
Also I'll have a look at the Rok modules and either see if I can modify them myself to be Mootools 1.1 compatible, or I'll bug RocketTheme about it...
Thanks so much for all your help... Great modules... I look forward to seeing more in the future...