Syphon issue with ofFbo

Hello,

I am facing a problem using syphon with ofFbo.
I am using oF 0.9.3 under OSX 10.11.4 and XCode 7.1

Without using FBO, publishing syphon is fine.

        ofClear(0);
        for(int i = 0; i < boxes.size(); i++) {
            ofSetColor(255, 255, 0, 255);
            boxes[i].get()->draw();
        }

When using FBO the application crashes

    fbo.begin();
    if (bTrail) {
        //ofSetColor(trailColor, trailLength);
        ofSetColor(0, trailLength);
        ofDrawRectangle(0, 0, 1024, 768);
    }
    else {
        ofSetColor(0);
        ofDrawRectangle(0, 0, 1024, 768);
    }
        for(int i = 0; i < boxes.size(); i++) {
            ofSetColor(255, 255, 0, 255);
            boxes[i].get()->draw();
        }
        fbo.end();
        fbo.draw(0, 0);

I am using

syphonServer.publishScreen();

so for now i have to use

ofSetBackgroundAuto(false);

instead of ofFbo for Syphon publishing to work

any idea ?