if i saved a replay with a shader, will u be ale to see it? (the shaders)

dependent.

Not everybody can run shaders so probably other people wont see the shaders unless they activate it themselves

People that have shaders will see replay with them if they will turn on them.

If you saved it in shaders, the replay will be seen by anyone who can run shaders. Similarly, you can also turn shaders on when viewing someone else's replay or a replay that wasn't saved in shaders.

Only when the person watches it with his shaders on. Some computers can't support that much graphics but if you save it as a video they will see it.

activated the shaders, but it automatically turned off again when i open the option menu, what happened?

Have you tried turning them on again?

This is a sign telling you that your graphics card isn't good enough to handle shaders.

oh, no, so i can't use shaders in both my pc and netbook.

thank you.