Was it broken the whole time or did they break mid raid? Did you disconnect from the game at any point in the raid? Was there a huge lag spike?
I have 10 charges of LOhI used one... In the middle of the green dino phase all of a sudden I couldn't use my Knight's Challenge my Knight's Challenge/Throw The Boom to re-establish aggro... It just wouldn't throw my shield... I checked to make sure I hadn't accidentally unequipped my shield because I had done that before at times (not in this raid instance) but it was definitely equipped...
It was at this point that I lost aggro and the dino went on a rampage killing off the rest of the party... When I was eventually able to reestablish aggro (because everyone else was dead) I was unable to use my LOH (it was greyed out on my hotbar) and was also killed... Because I couldn't use my LOH I informed the party I would reboot my PC and manually DC'd (went to windowed mode and clicked the in upper-right corner of the monitor) and restarted my computer)
When I reconnected our cleric did a jibbers and party rez and raised everyone... I was still unable to use my Knight's Challenge and LOH (it remained greyed out)... I was again unable to regain aggro and he wiped the party again... I decided at this point to call the raid a failure and the party released and dissolved...
I was still unable to use my Kight's Challenge (I went to the wilderness area to test) and my LOH was still greyed out... After rebooting my PC twice my LOH and Knight's Challenge were again available...
My mouse and keyboard are wireless but my mouse was fully charged the day before (it usually needs to be charged once every three weeks or so) and my keyboard had new batteries installed just a few days prior so I am positive that it was not an issue of low batteries in my wireless components... I hope this gives you the information you are looking for...