Same here, just tried to filter my bookmarks by a tag and it returned empty list. The bookmarks are there though and I can find them in fulltext search but not by the tag. Can it please get fixed soon?

They moved the PNG snapshots to the toolbar under the 'capture' icon and renamed them to "capture entire page". If you look on the firefox extension changelog, its mentioned there (https://addons.mozilla.org/en-US/firefox/addon/2792/versions/). I think Diigo is trying to decrease the load on their servers by hiding this feature away. Since I paid for the premium account, I expect to have my bookmarks also available as snapshots if needed and I expect not having to add another step to the process, I downgraded to version 5.1.0.1 of the extension to have the snapshots checkbox back. What can we do so that this change is reverted in future versions? Its one of the most useful features especially for academic purposes when one needs to save the exact version of the website when citing its content.