Cooldowns Bars in the middle of the screen

[Exense]

I've recently installed nUI+, and I really like it. Except for one thing - there's an indicator in the middle of the screen that says 'Cooldowns' that in raids will mysteriously show a 30 minute countdown bar for two people in the raid (a shadow priest and a holy paladin - the same two every time). When the countdowns expire, the bars disappear for a while, leaving only the 'Cooldowns' text floating right through my character's midsection.

Any idea what this is, and more to the point how to turn it off?

Thanks,
Exense (US-Llane)