Default ASP:Calendar Control - Not working

We have developed a "mini-website" (ASP.NET V2.0) and it's main use is via PDA login, one of the features upon login is a calendar (asp:calendar control) displaying for the selected month a number of jobs on each day. On many HTC devices the calendar is working fine, users can change the month, select an individual day etc. But on the HTC pP6500 the links on the calendar are non usable, i.e. clicking on a link on the calendar does absolutely nothing.

Anyone come across something similar?, and/or know of a resolution?