The release candidate for BGMP 1.9.3 is now available. This release fixes a few persistent bugs in the previous 1.9 releases. The biggest new feature in 1.9 is the addition of the MarkerClusterer library.
If you'd like to try it out, just download and install it. If you notice any problems, give detailed feedback here and then downgrade to 1.8 until they're fixed.
If you don't notice any problems, please leave a quick note here so that I know it's working for others.
I've also setup an email list to notify everyone when new RCs are available in the future. That way you'll have time to test it out on your staging server, and we can work out any bugs before the official release.