This error was reported back in 2006, but I can’t find a solution to it..
http://ellislab.com/forums/viewthread/61609/
I’m running EE version 1.6.9
When you evaluate {month_num} against {segment_4} it works for all months except September and August, both of which evaluate the same.
So using a conditional {if {segment_4} == {month_num}} to apply a class of “current” it will apply it to both August and September at the same time.
Works perfectly in June, July, October and November.
Anyone got any ideas about this, please