Using the example schetch OLED_Draw_Bitmap with Arduino IDE 1.6.7 I got the following error:
variable 'SeeedLogo' must be const in order to be put into read-only section by means of '__attribute__((progmem))'
if I put SeeeLogo as const I got a new error:
invalid conversion from 'const unsigned char*' to 'unsigned char*' [-fpermissive]
The only solution is to not use the PROGMEM flag, but it’s really creazy to waste 1K of memory only for one bitmap image!