select options not showing in IE8

Hi
I am using CB 1.9 with Joomla 3.1.5. I have a registration form with two select boxes. These show as blank in IE8.
Initially I thought it was a template issue but I have the same problem with all templates. See attached

Has anyone else had this problem?

UPDATE:
I found in the bootstrap.min.css, the following entry:
select,textarea,input[type="text"],input[type="password"],input[type="datetime"],input[type="datetime-local"],input[type="date"],input[type="month"],input[type="time"],input[type="week"],input[type="number"],input[type="email"],input[type="url"],input[type="search"],input[type="tel"],input[type="color"],.uneditable-input{display:inline-block;height:20px;padding:4px 6px;margin-bottom:10px;font-size:14px;line-height:20px;color:#555;vertical-align:middle;-webkit-border-radius:4px;-moz-border-radius:4px;border-radius:4px;}

if I remove -moz-border-radius:4px;
the problem is resolved.

Any ideas why, given that I thought IE8 ignored that anyway?

THANK YOU SO MUCH !!!!!!!
I had the same problem + some extra display issues.
Everything is now as it should be with this single CSS line removed :woohoo:

Please note there is a known issue with curvey corners (removed in CB 2.0) on IE that can cause blank dropdowns.

forge.joomlapolis.com/issues/3887

Please see the below for a quickfix.

www.joomlapolis.com/forum/240-potential-bugs/219270-drop-downs-on-ie-8-not-working?start=6#219512