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Okay, thanks for the info.

As far as I know, MySQL binds to all available network adaptors. I guess that would qualify as entanglement. Whether that is or has thrown MySQL seems unlikely now given your test result. Thought it was worth asking regardless because those things can be problematic.

I don't think you can do it that way... and now that I've had a chance to try a few things myself, it looks like the --debug switch is only for mysql.exe (ie. the client) anyway, so no good for us.

While searching on this problem I came across a thread describing similar symptoms to you. The solution in that case was to clean out c:\Windows\Temp. Apparently MySQL scans that folder on startup. If it contains a lot of files it can slow down startup significantly.

Continuing research...