Hal, i found this problem a few weeks ago. i never reported it cus i was using IE7 and thought it was just my computer. for it it would do the loading thing and just never drop it.
Wrex: on the right side of the screen click on "position" you can't do this from the "cockpit". once you clicked on "Position" scroll your screen down just a touch, you will then see on the far left side of your screen (just under the room map) a button "items" that will load the item screen for the lower half of your screen. from there you will see all the items that you have on you. if you click on the image of the item you want to drop, you will then see the option to drop it.
I hope that helps :)