First of all: thank you for the new feature "watch changes in category membership"!!
One thing I noticed: the link to the page history isn't working (see attached screenshot, lowest line "05:37"). Clicking on "hist" opens the file description page, not its history.
And if there are more than one actions for a category (see screenshot "08:54") there are links that seem to point to the category's history ("2 changes" and "history") but actually they point to the first file's diff and history (i.e. "File:Simon pass.JPG").
This only happens if the "group changes by page" option is activated in the settings for recent changes. Otherwise there are no hist/diff links at all.