I am trying to help someone with a Zotero error that is affecting her ability to sync. There's an error reading: [JavaScript Error: "Error connecting to server. Check your Internet connection."] -- despite the wireless connection working fine. We doublechecked to make sure the Zotero account info in her preferences was working and it was correct. Could not send a bug report because of Zotero's inability to connect to server. Full error message below. Any suggestions on troubleshooting this are appreciated!

[JavaScript Error: "HTTP HEAD https://s3.amazonaws.com/zotero.org/proxy-auth failed: Unexpected status code 0" {file: "chrome://zotero/content/xpcom/http.js" line: 517}]
Zotero.HTTP 4.0.29.14, platform => MacIntel, oscpu => Intel Mac OS X 10.11, locale => en-US, appName => Zotero, appVersion => 4.0.29.14, extensions => Zotero Word for Mac Integration (3.5.14.SA.4.0.29.14, extension), Zotero LibreOffice Integration (3.5.12.SA.4.0.29.14, extension), Silverlight Plug-In (5.1.20125.0, plugin), AdobeAAMDetect (AdobeAAMDetect 2.0.0.0, plugin), npSecEditCtl.MAC.BOC plugin (3.0.0.2, plugin), Java Applet Plug-in (15.0.1, plugin), Default Browser Helper (601, plugin), Shockwave Flash (21.0.0.242, plugin), Aliedit Plug-In (2.4.0.0, plugin), npalicdo plugin (1.0, plugin), Wangwang Plug-in (1.4, plugin), Thunder Download Plugin (28, plugin)