Omen2 is being so rapidly updated because It and Threat-2.0 is in beta ATM.
If you want a version that works: 67322 (as long as EVERYONE is using it) is one of the better ATM, it's threat numbers are unfortunately mostly ballpark though.
The reason why, is that blizz have been changing a lot (hot fixes) combat log wise and didn't finalise the clog before 2.4 went live, most addons that depend on clog are suffering similar problems, but threat meters are THE most sensative clog related addons.
The situation will probably start to stabilise later this week from what I've seen, the dev's of Omen/Threat are working on a new protocal but haven't implemented it yet since it has a few bugs in it.
My best advice is bare with it ATM.
Or just pick a version (intelligently) and sit on it for a while.
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