We discovered a bug introduced on Thursday, April 16th at 5:00 am ET that prevented the retrieval of side by side comparison matches for Internet sources. Users would have seen a warning "Problem retrieving matched paper. We could not retrieve the original source. We found a match on January 06, 2014 from this URL: http://en.wikipedia.org/wiki?curid=112336
". We resolved this issue on Friday, April 17th at 10:00am ET after discovering it on Friday, April 17th at 9:00am ET.