To help clarify all the confusion on what Grbl versions you should be using with BCL:
The following are the only Grbl versions I support:
Grbl 1.1e (to maintain compatibility with T2 Laser).
As I test and approve newer Grbl versions, I will add them to this sticky thread for all to see!
Please do NOT use other Grbl versions with BCL as I do not know if they will work or not.