[CLOSED][3.1.1] Odd shadow on combo box's dropdown list in IE7
We have a combo box whose store contains 376 items. When you click the combo box's down arrow, in IE 7 and only one some machines, a weird shadow appears above and to the left of the dropdown list. See attached screenshot. If we reduce the number of items to about 200 the problem doesn't occur.
When the shadow appears, a similar shadow will then appear intermittently for tooltips, other combos, the Calendar control, etc. etc. Closing IE or doing Ctrl+F5 will clear the problem.
Note: the behaviour of this 'artifact' is very odd, fairly machine dependent, and easily avoided by not having so many items in the combo's store. We will solve this by reducing the number of items. I don't expect a fix from you, but I thought I'd better report it.