RIM released the 1.0.7 software update for the BlackBerry PlayBook yesterday and it looks like the update has since been pulled. The details are sparse as to exactly why, however they have come by way of the official @BlackBerry Twitter account. That being said, according to the details we have seen;
Some users were experiencing issues with Bridge & 1.0.7. We expect to release an update with a fix later this week.
Otherwise, nothing specific as to what those issues are. But in the meantime, if you were in the group that did not quickly update (like myself), then it looks like you will be sticking with 1.0.6 for a while.