It is a fresh install of everything. I went to TV options, scan first for analogs, then for stb, then guide and at one point in the process mc asked me to select a receiver and port for the IR Blaster. I selected mce receiver and port 1. The strange thing is that I can tune channels through direct input with the remote, so the blaster is working. I can see the guide in Theater View and in a previous install of mc19 I could tune channels through the guide without problems.
If you think a rescan is necessary I could do it, just tell me how to delete the channels.