Look at the code:

<a class="ow_add_content ow_ic_picture" href="javascript:addNewPhoto53e680a211657()">Add photo</a>

Where are two slashes?

2. When photo widget is enabled, I can add photo from widget, but there is error in debugger:

[Error] Failed to load resource: URL (javascript:void(0), line 0)

Code (under the widget)  looks different: 

<a onclick="addNewPhoto53e680d32abce()" href="javascript://">Add</a>

3. Adding photos from Photo page works correctly.  

I reinstalled plugin, cleared cache, but nothing helps.

Please, help!