That's kind of messed up. Line 1078 of admin/user_tracking.php should have
Code:
echo$boxes['body']->infoBox($emptybgheading, $row['body']);


Which should appear just before a commented out </form> tag at the bottom of the code.

The commented out code is what "used" to be displayed (for the most part) and was left there to support comparison of new and old designs.

But, the tables should still be presented unless there is some sort of css that has been generically applied that would hide the table content. :/

When I tested this on ZC 1.5.5 there were some differences between that display and when used in an older ZC 1.5.3, but not so much so that the content was not present.

In "viewing" the computer code I don't see an unbalanced html comment, but would have to put the results through a validator of sorts to figure out what happened. Of course could just remove all of the html commented text as well which is expected to resolve that. But, I didn't have any major or minor differences between my running version and the fileset. :/

See if just before the <?php and echo that follows that adding --> fixes the display.