CreateDynamicGlyphFromFile not working in 10.1 + SP1

Hi guys,
With the ArcGIS Engine 10.1 + SP1, the IDynamicGlyphFactory::CreateDynamicGlyphFromFile does not work, so I cannot associate bmp symbols to my point features. I'm using the DynamicDisplay component.
It worked properly with ArcGIS Engine 9.3.1 and previous releases.
I'm using ArcObjects with ArcGIS Engine DevKit for CPP on Linux, and Qt 4.7.3 toolkit.

Any similar experience? Any suggestion?
Any suggestion will be appreciated.

Thank you.

Andrea (Italy)