Similar problem here. Saturday morning I woke up to 5" of heavy, but not slushy, snow. Great for snowball making but that's about it. I had no luck using my blower - the fan would get packed tight with the snow. I know it's working correctly because when I'd clean most of the snow out from the fan and engage the blower it would spit out the remnants through the chute.
My tractor is kept in a somewhat heated garage (50-degrees) so maybe the warm metal interacted with the not cold snow, it was right around freezing when I went out, to help it stick together. I should have taken pictures but there was a lot of snow stuck to the augers when I would stop.
I thought that I was traveling slow enough but maybe not. I did slow my pace down on one of my tries but it just seemed to take longer to pack up the fan.
At one point I cleaned the fan and sprayed with PAM but that had no effect.
Thankfully, I have a rear blade, which helped, but that was even a challenge. It would build up, rolling over and over and over - again, I should have taken pictures/video.
We've gotten a snowfall like this every season for the last few years and it's been very frustrating. Otherwise, the unit works great. I'll go around and see if any of the neighbors need help just so I can keep using the machine and blowing the white stuff great distances. Unfortunately, this time, I was embarrassed in front of my neighbors who were able to chew through it with their little walk-behind units while I had this big hunk of orange metal hanging from the front of my tractor - unused. Normally, knowing how wet it was I would wait until the next day when it was "dried" and wouldn't have any problems but I didn't have that option, unfortunately.
So, no real knowledge given here, apologies, but I'm glad I found this thread since I've been having the same confused thoughts. I will certainly follow this thread and report back if I can contribute any actual useful information.