Beta release 0.7.905 is now available. See the first post of this thread for details. In particular, that first page has a link to the beta manual. The template tutorial section might be useful to those of you playing with composite fields.
As mentioned above, this release fixes many (we hope all) performance problems related to the backup feature. In particular, it should fix the bulk metadata edit problems.
I anticipate that this will be the last beta release. This series will go to 'production' the end of the week unless a blocking problem surfaces.
Thank you all again for your testing. You do things I never would have thought of.