ISSUE
If you recall I blogged on this issue earlier and said I would investigate more. As a recap you can check out the screenshots to see the issue:
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Basicly, you will see the something like MomUIGeneratedRule with a series of characters after it.
WORKAROUND
This happens when you create a custom performance counter in a Management Pack that is not the “Default Management Pack“.
I have heard that MS are working on this and have been able to replicate the issue, we should see a fix soon so check back as I will be moniroting this one closely.