I believe the problem stems from the limit placed on movements at weekends imposed as part of the planning process at FAB, TAG believed this was going to be increased so earlier in the year allowed a lot more aircraft in at weekends in anticipation of getting this increase however this was refused so they only had a very small number of weekend movements left which resulted in the restrictions being placed in that only based aircraft could come/go.
Not sure if the quota finishes on the 31 dec so will have to wait and see what they will do in the new year....hope this helps