This sounds like the bug that has already been reported where an interuption to casting a spell either by a clicky item, or a normal spell, render's your UI locked up until you zone.
Some people can workaround it by using #castspell to free up the interface, but I've found that only to work in a few circumstances.
To avoid it until it's fixed:
1. Try not to cast when in melee. That goes for clicky items too.
2. Don't click twice on a clicky item too quickly. Wait until you are well and truely finished casting, and the recast timer has passed.
Hope that helps.
EDIT: Well.. It sounds similar, but I dont know why that would cause you to go LD..
-Auldar
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