Keil Studio no longer working - what's changed?

Back in May I had Keil Studio working on my ST board (NUCLEO-L476RG). Now it will not run or debug. I can still use the drag-and-drop method. Has something changed? Classes start in a few weeks and I no longer have a platform to use. Drivers are all up to date.

Preparing to run
Parse debug description…
Create system description…
Connect to debug unit (ST-Link)…
Configure debug unit (SWD @ 10000000 Hz)…
Create device map…
Connect (‘underReset’) to device STM32L476RGTx…
Assert hardware reset…
ERROR: Cannot open RDDI JTAG connection
ERROR: Cannot open RDDI JTAG connection
: DAP access error
ResetHardwareAssert
Item #0: ::Line 4
DAP_SWJ_Pins(0, nReset, 0);
Disconnect from device…
Disconnect from debug unit…