I almost had the website setup for iPhone and Blackberry and when I tried the "Standard Version" links at the bottom of the page, I received errors. Rather than worry about it, I was simply going to remove the links by unchecking them in the SelectMarkup modules. After doing this, the mobile version no longer works for either device. I reset things back the way they were and no luck. I removed and reinstalled MJ at least 4 times (since that's how I got it to work the first time). Any ideas?

SelectMarkup module cannot affect MJ (until user clicks on the module's link). So, the problem is in other place.
GraebeRob wrote:

What errors did you have?

They say time heals all...and without changing anything, when I tried again today, it all works again. It had stopped giving mobile version of the site for my iPhone, my Blackberry, and Firefox (emulating mobile device). Now it's all working again. Strange.