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I did see some notification that there were some scheduled maintenance happening, which may have affected to slow down your instance with success path analyzer reports. To check status maintenance status see Marketo Status.
With your recent launch of RCM it may be possible that your records are still being aligned with RCM's defined success path.
I actually set it to search for All Time. It works fine on my colleague's pc when he chose a smaller date range. I think I have my answer.