There is a bug in Table Builder when you insert a new row. Once you have inserted the row if you insert an image into one of the cells using a URL, the image link is automatically filled in with the same URL. It should be blank. When you save the table and click on the image, rather than opening up in a popup window, nothing at all happens.
Normally I will paste the URL into the link field and when you click on it, it opens in a popup.
For me this is a serious problem, as I update various tables monthly.
1 In an existing table, click Manage Cells, Click Insert Row After, Close and Save.
2 In the inserted row drag Image into a cell, click Insert from URL, paste a URL, click Insert Into Post.
3 Paste same URL into Insert Link Here. Save.
When I open the page on my website and click on the image, a popup of the enlarged image will appear.
Problem is that often when I perform steps 1 and 2, the URL is automatically inserted into the Insert Link Here field. In that case, when the image is clicked on, a popup does not appear. THAT IS THE BUG.