Hi! Apparently, it happens that we get an error "Frame buffer status: Unknown error". The error comes from the method checkStatus: -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= NBGLFrameBuffer>>checkStatus | status | self bind. status := gl checkFramebufferStatusEXT: GL_FRAMEBUFFER. status = GL_FRAMEBUFFER_COMPLETE ifFalse: [ #( #GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT #GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT #GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER #GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER #GL_FRAMEBUFFER_UNSUPPORTED #GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE #GL_FRAMEBUFFER_UNDEFINED ) do: [:sym | (self class bindingOf: sym) ifNotNil: [:b | status = b value ifTrue: [ ^ self error: 'Frame buffer is incomplete: ', b key ] ]. ]. ^ self error: 'Frame buffer status: Unknown error'. ]. ^ true "ok" -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Any idea what's going on? We took a Pharo 2.0, loaded Athens, NBOpenGL, SourceCity, and roassal3d. Running the test of roassal3d shows this. I suspect this error comes from some interaction between the tests. Closing an opengl window is enough to desallocate the opengl resources? Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.