Adobe provided an updated Lightroom version only a few months back and has already ramped up to a newer release by providing a test version of Lightroom 5.2. Strangely enough, Lightroom 5.1 seems never to have been made public. Products from the Adobe Labs website are not meant for productive use, but enable new and existing users to test new functionality and provide feedback to Adobe on possible bugs and issues. A release candidate is usually provided as an upgrade to an existing product a couple of weeks after having surfaced in the lab at no charge to registered users. When using the release candidate or beta be sure to install it in addition to your existing productive version. Better yet, be sure to backup your Lightroom catalog before contemplating the installation of any beta or release candidate.
A very important bug fix has been included in 5.2: a selection of photos that is alternately manipulated in the grid view and the filmstrip could cause unknown changes to metadata and possibly even the photographs themselves - a bug in the synchronization between grid view and filmstrip is responsible for this behaviour. This is a rather destructive bug that is an odd manifestation in a mature product – the use of grid and filmstrip is the primary means of navigation through a selection or catalog of photos.
Other notable fixes in Lightroom 5.2 include corrected behaviour of the Reset button in the Develop module as well as the correct display of metadata for a published photo. As with any other new release of Lightroom support for new cameras and additional lenses has been added. There are some new features, too. Changes to the spot healing tool and larger size options for Smart Previews are useful, as are refinements to the local adjustment brush.