That doesn't address the fact that interest-based ads seem to be the cause of the CTR drops, though, Bill.
How do you know that's the case for others, not just you?
Disable interest based ads for your site and let us know after a week or so if the problem corrects itself. I've never had interest-based ads enabled, sounded like a bad idea, didn't let it run on my site ever.
Others claim removing GA is correcting the problem.
Purely speculation when it's only been a day or two for any of those changes.
Brief spikes and dips do not make a trend.
It took weeks to discover a sustained problem, it will take weeks to prove a sustained solution, and then it will take more time to analyze whether any so-called solution solved everyone's problems.
In the end it could all be a bug, a fluke or multiple issues, but I'm still betting the long term effects, which we've seen happen over and over again, are smart pricing and advertisement adjustments like netmeg discussed.
Some have even ignored that it could even be simple SEO things on your site that need adjusting to better target the visitors and the ads.
Google adjusts their algos all the time so the key here is to figure out what has specifically changed and adapt because neither SEO nor AdSense are static and what works today may not work as well tomorrow and may completely crater in a year.
I don't know why you find it so hard to accept that there might be a software bug that's "losing" clicks
I'd be more inclined to suggest that removing the Analytics, which they may use, changed the types of ads you may be displaying which resulted in more clicks.
If you honestly thought you were ever losing clicks there are click tracking scripts you can install on your site that will count the number of clicks in AdSense that can be compared with the AdSense totals.
No need to randomly speculate when the tools are available to collect absolute empirical evidence of whether or not they actually have a bug in click counting.
If that was in fact the case, and lots of people have run those click counters in the past, there would certainly have been a lot of screaming about the discrepancy in all the AdSense forums over the years and there wasn't.
Not saying something new can't be happening here, but the tools to measure clicks exist.