....we think it might be a logger issue -
"It's still recording the data" (where?)
"highs and lows are available through the weather bulletin"
" I get nothing when I go to the browser either."
"I'm getting data on ...the weather bulletin screen"
I'm not totally sure from the words you are using, but I think you are saying you can't see anything if you use WeatherLink software - but if you look at your site on WeatherLink.com, you can see data.
If that's the case, the WeatherLinkIP logger is properly sending data to WeatherLink.com, but your computer (via the WeatherLink software) isn't getting the data.
This may be an issue with how you have configured the WeatherLink software to get the data.