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
