Error message: There was an error starting zotero
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I'd also recommend scanning your system for malware, if you're not already. (Not sure if that McAfee scanner in your screenshot is up to date.) It's possible that could be causing this, though not sure exactly how.
ReferenceError: dw_locktimer is not defined js.php:1:771748
TypeError: $tree.dw_tree is not a function js.php:1:360173
TypeError: History.getState is not a function _zoterowwwAll.bugly.1411506646.js:4478:20
Use of getPreventDefault() is deprecated. Use defaultPrevented instead. js.php:1:0
Sorry, running out of ideas here. Since Zotero Standalone is working, what Zotero Standalone version do you have?