@hogi - Thank you for your suggestion! We have captured your request and will take it under consideration.
Seems that this issue got solved in JMP 17.0.
No missing second characters anymore 
@Sarah-Sylvestre
this wish can be closed.
Seems to be fixed with v17.
☐ cool new feature
☐ could help many users!
☑ removes a „bug“
☐ nice to have
☐ nobody needs it
The code in the formula editor can be either constructed by clicking on variables, columns or function in the menu on the left, by dragging items into the formula window - or directly by typing in the code.
In the latter case, after typing in the first character, a small jsl code editor pops up and the user can continue to enter the code.
There is even syntax highlighting
Unfortunately, it happens very often that the second - or even third - character is lost:
Do other users experence the same issue?
What's the benchmark typing speed? 3 missed characters?
I hope, the issue can be fixed in a future release of jmp
