There are currently a few bugs in the editor that is used as areplacement to the strings tab to add tags.
It regularly happens that clicking the checkbox doesn’t select the string. This ist rather annoying since it results in a lot of page reloads if you want to do mass changes to tags.
You currently can only change the tags for one page of entries (50 strings). If you select all strings and make any changes, nothing happens.
I know this feature. Problem is - if I use it and then try to change labels nothing happens at all. Label changes currently seem to be restricted to the page currently displayed.