Oops - descriptor pointer should be assigned, not incremented with the new type-safe code.

LUFA/Drivers/USB/HighLevel/ConfigDescriptor.h

@@ -269,7 +269,7 @@
 			{
 				uint16_t CurrDescriptorSize = DESCRIPTOR_CAST(*CurrConfigLoc, USB_Descriptor_Header_t).Size;
 				
-				*CurrConfigLoc += ((uint8_t*)*CurrConfigLoc) + CurrDescriptorSize;
+				*CurrConfigLoc  = ((uint8_t*)*CurrConfigLoc) + CurrDescriptorSize;
 				*BytesRem      -= CurrDescriptorSize;
 			}