Problem with MS Access runtime

I've made a little progress with packaging and making a runtime file for my Access 2007 app, using Microsoft info pages, but for some reason I'm getting a blank application open when I test-package it and then try and run the file.

Basically, I created a private certificate using Office Tools, did a "package
and sign" inside Access, then (as advised by MS) changed the file extensions to .accdr, created a shortcut and edited the shortcut executable so that it had /runtime at the end.

What actually happened is that it opened up a blank environment, but with the Acrobat tab of the Office 2007 ribbon showing (and nothing else). (I have Acrobat 9 Pro installed). No idea why???

What I want it to do (at the moment) is open up one of the forms by default, so users can enter information- or even better, open up multiple forms together.

In the Access Options for the database I set it to open the desired form by default, under Current Database options, and then I did a Package & Sign again. However it still comes up blank, whether or not I run the .accdr file, or accdb with /runtime.

Any ideas how I can fix this?

Thanks!