Minecraft shaderbugg?

I installed a bad one in Minecraft.

Quite normal as in some YT videos. Now I have only the problem that I can't write in all minecraft.

So about; I want to write something and then press T, then I write my sentence send it off but then it says: Chat message could not be sent.

I do not know why it is but I believe in the shader… I ask for help because otherwise I have no desire to play mc. Thanks.

You have to click on options in mc on chat settings and then on chat until there's chat show

Is that the same on other servers?

Does it work without shaders?
Does it work on other servers, e.g. Neruxvace.net or rewinside.tv?