may someone of you confirm that? since OSX 10.9 had been released, I got problems with all kinds of Braille displays that are connected ether via Bluetooth or via USB connection to both of my mac machines. During the regular sessions, the connected braille display reacts fast and without any performance delay. As soon as I chose any app using the dock, the Braille display suddenly change to a incredible mad duck. Often it takes nearly 2 or 3 seconds until a character that was entered is shown on the display. You may imagine that such large delay times aren't really amusing.
Regular, I use a Braille display by FreedomScientific. Unfortunately the bug described above occurs with several displays of other manufacturers I've tested for the last four weeks.
Do you got any idea how to solve that problem?