Ofxgui : text missing

Hi.
I'm building an app based on the multiWindowOneAppExample to put the gui in another window.
I noticed the same problem when I set the GL version to 4.1. It seems that gui text is missing when another version than 2.1 is used, problem occurs with 3.2 too.
Then I tried to reset GL version to 2.1 back before creating the gui window like :

ofGLFWWindowSettings settings;
settings.setGLVersion(4, 1);
shared_ptr<ofAppBaseWindow> mainWindow = ofCreateWindow(settings);
settings.setGLVersion(2, 1);
shared_ptr<ofAppBaseWindow> guiWindow = ofCreateWindow(settings);

but it doesn't work, actually it's worse, everything becomes glitchy.

Arturo, as you already fixed this kind of issue you should probably know what to do ?

Thanks.