When I close all apps in the recents tray, I cannot access any of the apps (16) that are listed as installing (but frozen) in the updates page of the App Store. They show as greyed out and will not open.
UPDATE with SOLUTION THAT WORKED:
I went into a store here in Singapore that sells Apple products and asked them. The nice young man there told me to delete all frozen apps and reinstall them. It works-- it reappears as usable.
Meantime: I seem to have unblocked something when I deleted several apps to reinstall, as the list unfroze...and then shortened to gone as I've typed... and when I clicked on the other greyed-out apps on my desktop, they showed as first loading, then installing--complete with blue install-progress line. When done, they work. Just now have to re-download all my books from my kindle app that went back into the cloud.
Good luck to any others frustrated by this problem. I intend to not do updates again until I read that Apple has fixed this glitch. Updates are not worth all the hassle and time expended that this has caused!