Click Listboxes and the UI freezes

Hi

I've got a form which has a listbox on it, as well as a search button and of course the data entry text boxes. However when I click anything in the list box the whole UI freezes and I can't click any buttons or change anything in the textboxes.

Any ideas whats causing it?

Can we See your code. Maybe your code is causing the UI to freeze. Maybe some Routine is running in the background and cannot continue another Statement to run until it finish.