Here you can see a color table (same coding as resistors) for inductors:
Current rating as Hal pointed out maybe the issue here. By the size of it (it seems to be size of 1/4W resistor from the picture), it is probably not rated for 1.2A as required to be used by the MAX756 IC.
On this page of the Digikey US catalog you can see similar inductors to yours and their dimensions. The rating is indeed much lower at 190mA.
On the paper Digikey catalog (Hong Kong version 051), I found some more inductors similar in size to yours and they are all rated at 144 mA to 295 mA.
All axial inductors rated for more than 1.0A seem to be at least 10 mm in diameter.