Note: this beta was re-released May 18th with an additional fix.
The Steam Client Beta has been updated with the following changes:
General
Fixed a case where the non-steam game list could load from an invalid user profile.
Steam Input
-
Restored the previous default of no deadzone for gamepad outputs bound to joystick
Source: https://store.steampowered.com/news/gro ... 1960277043