Lockscreen
Generally no problems at all, but occasionally the lockscreen freezes and I cannot logon.
Have to shutdown and start again, when all is then perfect and back to normal.
OK its a problem that can be fixed with major surgery as can the disabling of the lockscreen, but I do not wish to challenge fate.
Solution - Press - CNTRL + ALT + DELETE
My login screen then appears immediately and all is OK to logon.