I deleted switching.log and
I guess the miner is correctly mining?
Do you see the word "Stratum" in the first line of switching.log?
If so, i'd recommend trying to start with a fresh download of 4.2.3.
Really only a guess here as I cannot repro it.
MrPlus
This is fresh install 4.2.3.
Swithcing.log :
"date","Type","algo","wallet","username","Stratum"
"2018. 07. 16. 13:29:21","NVIDIA","X17","3KjbngWMVD8XrHStXGb3V9fGjVQK4E5CRs","k2laci",""