Fantastic addon but not working after synchronisation Rated 5 out of 5 stars

I love this plug and I use it all the time. Unfortunatelly it stoped after synchronisation. I use Firefox with this plug on two laptops. Last week I decided to synchronise them via Xmarks and something went wrong. I cannot add any page to Save-To-Read any more. I can see its icon but it is not active. I checked bookmarks and everything is ok - I can see Save-To-Read folder. I reinstal this addon a few times, restart FF and computer, changed folder's name in Preferences and created related folder in bookmarks but Save-To-Read icon is still not active. What is wrong ? Maybe plugin needs any additional function for checking its own configuration/folders/reinstallation ?

Greetings!

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EDIT: July 24, 2013 9:20pm
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Thanks a million for help! Addon works again :)

Please try steps in Developers Commets on English version of add-on page.