What device? So, you can see icons on your home screen but when you tap them nothing happens except just a black screen? Have you tried safe mode?
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Further to my earlier post after installing A12 the homescreen shortcuts that didn't work were all webpage shortcuts using chrome browser. I have since renewed all of the webpage shortcuts that didn't work by using another browser. They all work now, so there must be a problem with the chrome browser.
Sometimes, those website shortcuts can get messed up. I've seen posts about how they can disappear after an update to Chrome itself. If you remove all of those shortcuts and then re-create them, do they work again?