Problem with Greek Yogurt theme block, after upgrade won't delete

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I updated to the current version of Concrete 5 for this website (which uses the Greek Yogurt theme):http://www.trianglegrange.org/index.php?cID=1...

It now has an extra block that I cannot delete. It is the theme block "add to sitewide site name", but is only a problem on the home page. It shows up as a duplicate block of photos above the original. When I open the editor for the block I get this message: "Unable to retrieve block object. If this block has been moved please reload the page."

When I just delete the extra block it changes to a content block that says "Welcome to the Triangle Grange 533" in an awkward place. When I open the editor for that block then I get this message: "Fatal error: Call to a member function setBlockAreaObject() on a non-object in /home/crieger/public_html/trianglegrange.org/updates/concrete5.6.1.2_updater/concrete/tools/edit_block_popup.php on line 15"

When I delete this block then it goes back to the duplicate block of photos that I originally deleted. It just won't let me get rid of it.

I tried putting public_html/trianglegrange.org/updates/concrete5.6.1.2_updater/concrete/tools/edit_block_popup.php on line 15"

...into the search function of the File Manager in the cPanel to see if it would take me to the problem. All I got was: "This directory is empty."

Could somebody help me delete this specific block please?

Thanks for any help...