I searched already and don't see anything definitive. I see a post from Cliff saying he was fixing something about the Intelligent mode without specifics. I do see a lot of people are having the same issue, so I'll re-ask: Bug? Obviously if a lot of people are getting artifacts, even if it's a design / expected thing, then perhaps there is something with how the design is set up that is causing the issue. I've played around with a lot of different settings with the Intelligent mode and none of them make the squeeking artifact go away other than using Classic mode. It would be nice to use Intelligent since it's supposed to be more, well, intelligent, but the artifacts make it effectively unusable.
In any case, having Intelligent be the default on the input block is perhaps not the best option if it introduces artifacts?