I got a call back from tech support at 3:30P (< 30 min response time!).

Apparently, they were trying to fix some of the ghosting that occurred in previous versions of the software and got "too aggressive with it." They are aware of the problem and will be rolling out an update "earlier than anticipated" to fix the software problem. Interestingly, they said that the refreshing problem depends, in part, on the writer. From the way I interpreted the message, this means that perhaps writing slower, larger, etc. may prevent the problem. It also may explain why not all users are experiencing the problem. They're going to follow up with me in the next few days for instructions to roll back to 1.6 should that be necessary.

I hope this helps anyone experiencing the problem.