I've created a level … and now he's gone! And I can do it again and again!

OK, everything worked fine. UP TO: I have added another source with a check box, in addition to the SER level created automatically. Once I did, the level disappeared !!!!!!! : o

A real mystery, no !?

I can do it again and again. BUT – U can not use the names of the missing projects. So where are they ?! : /

Ideas???!?!??!??!?!? THANK YOU!!

PS: I've already experienced this many times. What's new NOW who makes this happen ?!