One of my systems would not upate my Yoyo-score, so I detached and tried to attach the project again.
No such luck: I get a message that the url is that of a non-existant BOINC project ???
Are you running boinc ver. 7.2.39? If so, upgrade to ver. 7.2.42. Ver. 7.2.39 has a bug that causes the language setting to send gibberish to project servers and yoyo seems to be the project most sensitive to the gibberish.