Seems to be a new issue with 5.1.8 (as least had it not before).
In a longer chat nothing is transmitted any more. Both sites are signalling busy ( and do not send). For varaHF Softmodem frequency is free.
Had this issue yesterday, and also today. In both cases the partner was also using varAC 5.1.8 - with same situation (nothing sending, signalling of busy).
73 de Roland DK4RH
Its a bug with the VARA modem that under rare conditions both sides expect the other side to send something.
It was much worst before but the VARA author made some changes and it is almost gone. but still can experience it...
will revisit this with he VARA creator
73s