I've been on a radio hiatus for about a year. Using a new PC now and install VarAC fresh. VarAC changed my rig to LSB after a change back to slot 1. I've seen this happen once before in the past day, but don't recall what caused it.
My rig is a Yaesu FTDX10 and I use DATA-U as the mode. Don't see anything in setup that specifics the default mode in VarAC.
de Steve N6VL
Thanks for the replies! Eventually the problem didn't repeat again. Unsure of the cause or remedy. And I did get the latest the VarAC_cat_commands.ini file.