A recent update (we think KB4074588) has started causing major issues with USB keyboard/mice attached to systems. We have a number of X1Cs and SP4s that recently received this update and are now not able to use USB KBs/mice; the system devices work fine. If we restore the system state we get a BSOD unless the "Disable Driver Signing" option is enabled.
This isn't affecting all PCs with this update, but is raising some concerns on whether there is a bug in the patch. Has anyone else noticed this issue?