SFML 1.6 problem on ubuntu

[blueeyedlion]

I have sfml 1.6 working on windows, I made a little test program with a moving rotating square.  When I use that exact same code in ubuntu, the window simply copies what is behind it at the time of creation and draws nothing else.  There are no compile time errors and the input seems to be working, using <escape> to close the window anyway.

Does anyone know what I could have done wrong?

[sbroadfoot90]

Please post minimal code that reproduces error.

[blueeyedlion]

Alright, found the problem.  I forgot app.Display ().