It seems to go through the motions, downloading etc and when it is due to reconfigure itself, it disappears.
This is a new installation on a new laptop (previous computer worked ok).
Tried un-installing and re-installing uVision and Si8051F_uVision.exe driver.
Suggestions?
And I don't have any 3rd party add-on in uVision. Not Silicon Labs or anything. Debugger device is ST-LINK v2.