Looks like a bug, I've tested it on my boards and its coming up the same.
Try removing one of your image url's and see if you can double click.
I also used this modification that works well:
https://vborg.vbsupport.ru/showthread.php?t=244351
--------------- Added [DATE]1323353505[/DATE] at [TIME]1323353505[/TIME] ---------------
Re-tested - now as working as intended