[SOLVED] Missing Month/Year Expiration fields in IE 8

We're using CBSubs membership subscription for our client but have encountered a recent wrinkle. Using the Authorize.net gateway for payment when you get to the payment page to enter your card information the Expires fields for Month and Year are showing as blank drop-down menus and as such preventing payment/renewal.

I've tested the page in Firefox, Chrome and IE9 and it works properly it's just IE 8 & 7 that the issue is occurring. We're using:

CB Version: 1.8.1
CBSubs Version: 2.0.2
CMS Version: Joomla 2.5.6
PHP Version: 5.2.17

I've ran the server error log and the only errors I'm getting are:

Notice: Undefined variable: mainframe in <span>/</span>home<span>/</span>acggnew/public_html/plugins/content/mooaccordion/mooaccordion.php on line 14
Notice: Undefined property: stdClass::$id in <span>/</span>home<span>/</span>acggnew/public_html/plugins/content/mooaccordion/mooaccordion.php on line 39

Any thoughts on what might be causing this?

Probably just a CSS issue as the dropdown is expanded as if content exists. Switch to default Joomla template and confirm if issue persists. If not then consult with the developer of your template for debugging of its CSS.

I've ran the server error log and the only errors I'm getting are:

Bug in your 3rd party Joomla content plugin "mooaccordion". Please contact the developer of said plugin for support in regards to its notices.

That was the case. Tried an alternate template and everything functioned. Did some tracking through the CSS and located the problem in the following tag definition:

fieldset select {
float: right;
padding: 2px;
/* -moz-border-radius: 5px;*/
-webkit-border-radius: 5px;
-khtml-border-radius: 5px;
border-radius: 5px;
border: 1px solid #666;
width: 206px;
}

For some reason the -moz-border-radius was causing an issue, comment the line out and everything works properly. I'd really like a reason why this is the case, but for now I'll settle for the problem being fixed. I'll save the mystery solving for a rainy day.

Thanks for input!