There were some issues (that is one reason we did not update the supported version list for 6.7), and since it is not supported, we did not go any further. If you run in an unsupported environment, and you see an issue, you will need to reproduce it in a supported environment before Support will engage.
The multi-process Event Server is a big reason to go to 7.5.1 BTW, if you do, request patch 60894.
BocaBurger
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The pen is mightier than the sword, but the sword hurts more!