As an ex-Ghostery user, I can vouch for this. I switched to Disconnect after recommendations from HN-ers and thus far it seems to be doing a better job of not breaking sites and leaving users scratching their heads wondering what to do.
http://www.businessinsider.com/evidon-sells-ghostery-data-to...
What webmail provider are you having issues with? Feel free to shoot me an email with that or anything else you noticed at eason@disconnect.me