The IC-706 has a CAT command to control PTT on and off, but does not have a CAT command to determine if the radio is in transmit. Because RigPi can have many browsers open for the same radio, it relies on the CAT Transmit status to keep the PTT buttons on all the possible browsers in sync. RigPi 2, currently in Beta, has a fix for this issue. RigPi 2 will be available for download from MFJ in the near future.
73, Howard W6HN