Thanks Robert for your reply
I have done a local install and it works. I have actually done this same install on another DNN website, and it works too. I am somewhat convinced it is a problem with the GoDaddy environment, but the working site is also house on their servers.
The issue I have seems to be AJAX related, as when the AJAX option is disabled, I can successfully navigate and operate DNN controls such as the Manage Password, Manage Profile buttons on the Manage Profile form.
Switching AJAX on however gives a popup message whenever I try to use one of the controls. For instance, the Manage Password gives the following:
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Sys.Webforms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled.
Details: Error parsing near 'ost > Host Settings|</object></layer></s'.
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The module I've installed is a shopping cart/eTailer suite from Emerald Solutions called eTailer. It installed very easily on my working site, and is great, but on this install, it just won't take, because it needs the AJAX environment. So this is where I am stuck, as I know very little about AJAX and its setup for DNN.