The skin isn't properly coded for the 3.4 series. If you have no applications, no hooks and no modifications installed, then it works fine. But, if you have anything installed, besides IPB, that error happens. I stopped using it because the Curve and Curve Black skin simply isn't completed. I'm posted inquiries about this but keep getting the same "it works for me" replies with no solution on how to fix it. Someone who is familiar enough with IPB 3.4.3 skin coding needs to fix the skin and update it. I couldn't even figure it out so I stopped using it.