...
Enable Hidden items in View option and select AppData folder:
Go to folders \Local\1C\1cv8 and \Roaming\1C\1cv8 and delete cache there (cache are files which has alphabets and digits as file names):
2) For on-premise clients, one more folder should be cleared. Open About option in the main window of the application:
...
Go to this folder and delete all files, which have format .cfl and .cdn:
Thanks Thank you for being a First-bit CustomerFirstBIT customer!