Hi Malcolm's Mom,
Thanks for letting us know about this. There is actually a known bug in our system specific to Internet Explorer 8.0 that causes the "Choose Item Specifics" window not to refresh automatically when an option is selected that is supposed to cause new options dependent on that selection to show up.
The "Size" drop down menu is supposed to be greyed out until something is chosen from the "Size Type" drop down menu, but that is not happening in Internet Explorer 8.0 due to this issue. We're not quite sure when this will be fixed yet, but it is on our list of issues to resolve as we conduct future site updates.
In the interim, you could potentially avoid this problem by a different browser like Internet Explorer or Firefox instead, as I suspect you were doing when you used your Mac at work. The Firefox browser can be downloaded free of charge from http://www.mozilla.com
I hope this helps. If you have any additional questions about your Auctiva account, please feel free to contact our customer support team using the form on the following page of our site: http://www.auctiva.com/help/requesthelp.aspx#