Is there a limit of the "length" of the command line

Preprogramming a show for the summer at the moment with a LED Matrix with 512 RGB Pixels

During programming of my groups I run into a problem that the command line was "full"
I couldn´t even delete stuff I typed in. Only thing that helped was pressing clear.

Anyone had this before?

Roadhog 4
1.2.0 b540
Kensington Expert Mouse
Midi/LTC Widget