Tapestries is very fragile after the update. Plenty of us are getting in a situation where it's just flashing (a loading/crashing cycle).
Best you can do is open Google Play (if you have trouble, either go to the lock screen and swipe up or long press on the Home button to run Google now and go to Play through the card there that should be warning you that Google Search wants to update) and download an alternative launcher (GO Launcher EX, Nova, etc.) to use until Kobo gets an update out to fix the problems.