Hello,
Same problem here!
before Google Chrome Internet History Cleaning with PIRIFORM CCleaner Professional (V5.42.6495):
%USERPROFILE%\AppData\Local\Google\Chrome\User Data\Default\Preferences
"partition":"default_zoom_level":"x": 2.2239010857415451 (= 150 %)
after Google Chrome Internet History Cleaning with PIRIFORM CCleaner Professional (V5.42.6495):
%USERPROFILE%\AppData\Local\Google\Chrome\User Data\Default\Preferences
"partition":"default_zoom_level":"x": 2,2239010857415447 (= 150 %)
The comma instead of the dot is the cause of the profile error!
MICROSOFT Windows 10 Pro (x64, German, Build 10.0.17134.1, Version 1803, April 2018 Update "Redstone 4")