Forum user Wollino came into the help channel reporting that the alt+U window's menu choice for "send to" is grey'ed out in 7.64 but wasn't in prior versions.
I've not been using this feature, so I hadn't noticed this until they asked about it. The choice is also disabled for me too, and I can't figure out how to enable it. I was using the default list of 3 items from inside the installer, so it couldn't have been caused by having done something wrong in adding url's. It has nothing to do with whether the cather is on/off, and I also switched default browser to no success.
Also something else I noticed about the sample url's is that the 3 provided links remain being http:// even though the actual links have been updated to https:// which might mean the url list should be evaluated for other desired updates.