Weird bug which I'd appreciate some help on. When viewing a Potential, and then wanting to add a task by adding a New Task under the Open Activities heading lower down the Potentials screen, if I click on a date in the Calendar the whole form disappears. So it's impossible to add a New Task that way, which is the way my client wants to do it (works fine if adding a New task by clicking on the "+" button on the menu bar.

 

This only happens in IE10 - no problem in Chrome or Firefox. Any ideas?