Our guild is La Psychadelica [Psych] and last completed guild quest was "Fun With Snow".
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Hi, since the last maintenance my guild quests are in the waiting quests tab so there is no way to finish them.
The guild page shows my quest as open.
Yesterday: http://i.imgur.com/y2dhzIh.png
Today: http://i.imgur.com/3pW4zEF.png
Only thing I can think of is the game counted you as inactive on the day that you guild received the current quest. Until the current is completed I can't think of anything that you can do.