Hello everybody!
I'm very happy to tell you that I finally solved the problem in my blog!
I don't know what happened...one day I was modifying one of my posts (using Ubuntu) and when I saved it everything changed!!! I could not change colours or format any more! And stating that my blog had a black background and the writings turned into black it was impossible to read .....damn!!
Actually I still do not know how to solve that problem, or what caused it...I just created another blog and erased the old one....
If anyone of you out there knows what could have created my problem can explain it to me, please??!

See you soon!!