Group by Unit not Allowing me to Print

For awhile now, when attempting to print custom reports, everything works fine unless I select the "Group by Unit" feature. A couple of months back this feature broke and I reported the problem through the Feedback system. It's still not fixed. Whenever I attempt to print any report that has the "Group by Unit" box checked I get the error message:
File Not Found
Firefox can’t find the file at https://lcr.churchofjesuschrist.org/api ... .....<long path>
Anyone else seeing this?
Is there a work-around to get it to print?
Thanks

PS: I get an error regardless of the browser I use.

I am also having the same issue. Any custom report does not allow for grouping by unit version to be printed.