Oh, how are you arranging your LEDs? Something like this (with or without the 7th column)
5 11 17 23 29 35 41
4 10 16 22 28 34 40
3 9 15 21 27 33 39
2 8 14 20 26 32 38
1 7 13 19 25 31 37
0 6 12 18 24 30 36
If so, your code turns on and off the lower left LED, right? (or the zero pixel wherever that is with your arrangement)