I have definitely seen quirkiness with some of the authoring capabilities (like the Sidekick) in Chrome. As of 5.4, I believe Chrome is NOT an officially supported browser for authoring, though I've found that 90% of the time it works fine. In CQ5.5, I think Adobe has updated the browser support some, but I don't know the specifics off-hand. To be honest, the most reliable browser for the authoring environment is Firefox, in my experience. I generally use Chrome, so I will use that until I run into a quirk, at which time I will switch to FF for that one operation. I've found IE to be extremely inconsistent.