As per title. In the end i had to restore back to previous (17.4.4) via macrium reflect.
Speccy shows my graphics as:
SONY TV (1920x1080@60Hz)
2048MB ATI Radeon RX 460 Graphics (Gigabyte)
The mouse is a wireless optical Tecknet M700. The ''jerkiness" was apparent particularly with a big swipe from stationary when the cusor took maybe half a second to 'catch up'.
Can anyone suggest a solution please? I did delete the C:/AMD folder after updating - could this have been the problem?