In my case, "Top snippets used in last month" was initially empty in TextExpander 5, but that's because I've been using TextExpander 6. I expanded a few snippets and switched the popup then switched it back and found that it has data. If you do so and still get nothing, please get in touch with support: https://smle.us/support
. If you can choose Help -> Enable Logging, Help -> Enable Detailed Logging then repeat the swapping the popup and send along your Console log that would be great, too. Also, please double-check that you're using TextExpander 5.1.4.