I recently came across an issue with the Resource Names dropdown menu when editing Projects in PWA with Internet Explorer 7.0. The issue is that when you click the resource names field for a task at the bottom of the IE window in PWA so that the menu opens upwards above the task you are not able to select the resource as the menu disappears when you hover over it. It works fine if you click the resource name field for a task at the top of the IE window as the menu will open downwards below the task. I am not able to replicate this behaviour in Internet Explorer 8.0 or 9.0. Below are some screen shots to show the error as the explanation is not that clear!
Firstly click in the Resource names cell at the bottom of IE to get the Resource Names menu to load upwards:
Then hover over the menu as though you were going to select a resource:
As you can see, the menu disappears.
This functionality works as expected when using Internet Explorer 8.0 and Internet Explorer 9.0.