Massive Rank Changes in Bing/Yahoo Only - What's up w/ Rank Tracker?

[SVmedia]

I'll be honest, it's pretty shameful how little attention I give Bing and Yahoo. But something recently caught my eye - I have a client who according to rank tracker is all over the place in yahoo/bing...up 20 positions for some kw's, down 12 for others...meanwhile Google's holding steady, and Google data seems mostly accurate - with one exception of showing 46th position for an exact match branded search that they're #1 for.

I know Rank Tracker has been going through some fine tuning, right?  I don't manually check Yahoo/Bing - I can't imagine those #'s are accurate though.  Am I right to assume it's incorrect data?

Just curious, any insight would be much appreciated.  Thanks

[i3MEDIA]

I stopped using Rank Tracker a long time ago the other tools they offer don't seem to have many issues. But Rank Tracker like you say got hit hard and I really cannot trust their results. Fine tuning maybe but I've not read anything to make me move back to using Rank Tracker.

And I would say its incorrect yes.

[Abe_Schmidt]

We have made many improvements to Rank Tracker and accuracy is a top priority. I would recommend testing out our new super secret Rank Tracker Beta: http://ranktrackerlb.seomoz.org and letting us know if you see any big discrepancies that we need to be worried about. We are working hard every day to make sure this tool is awesome.