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I don't know if this has anything to do with the algo update, but at least your not the only one. I saw a competitor ranking with a second version of their homepage. The second version had utm parameters behind them.

Luckily the page with the utm parameters disappeared from the serps this morning. He was actually ranking first with the normal version and second with the version with the url parameters. This was on some pretty competitive keywords and lasted almost three days.

Penguin 2.0 was a great update for one of my biggest client. A website that was using terrible black hat techniques and ranked first on the most important keyword in my clients niche got kickt from the SERP's and my client jumped from 4th to 1st. The jump in traffic was enormous and on top of that 5% of the traffic converted instead of the usual 2,5%- 3% on other traffic.

Untill July 2nd. Traffic from the keyword dropped by 80% while we were still in position 1, after a lot of digging I thaught I found what caused it, Google booted the keyword from their autofill.

My question is if anyone has seen a removal from tthe autocomplete making that big of a difference in search volume.