My CWOP data posted just fine over the weekend, but I had the exact experience you describe the previous weekend. When I checked the WeatherCat Status tool, I discovered the CWOP uploads had stopped. Rebooting WeatherCat restarted everything and I never could figure out why the CWOP uploads stopped for most of that weekend. Don't know if the problem was on my end or theirs but since all other uploads were running (WU, PWS, Met, etc) I assumed CWOP had a problem. It's been fine since then.