[bug?] Can't save frame if using specific size

@javl wrote:

Ok, this is an odd one which took me a while to figure out.

Create a new project and add this draw() function:

void ofApp::draw(){
    ofSetColor(255, 0, 0);
    ofDrawCircle(ofGetWidth()/2.0, ofGetHeight()/2.0, 50);
    ofSaveFrame();
    ofExit();
}

As expected I end up with a file called 0.png with a red circle in the center.

Now in main.cpp change the canvas size:

ofSetupOpenGL(910, 512, OF_WINDOW);

Run the program again: this time you (I) end up with a black image, sometimes with some noise at the bottom.
Some quick testing didn't show any logical pattern. There is a whole range of sizes that don't work, while others do (800x512 works, 950x512 doesn't, 1000x512 does, etc.)

Before I file this as a bug, thought I'd check here to see if there is a logical reason for this error. Not sure if this could be hardware specific for instance

• of_v20170414 (about two weeks old)
• Linux 64 bit Debian Stretch (testing)
• Nvidia GTX 1080

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