css - fixed header have a strange error - transparent text? -


i have fixed header , when scroll page, text transparent, in 1 section of web.

example :

http://198.199.80.178/anuncios/prueba-ultima

and move scroll bottom , looks @ header.

i use same css other section of web , happens in section, in others not happens.

look @ example :

http://198.199.80.178/anuncios/buscar?utf8=✓&precio_min=0&precio_max=6000

if scroll web bottom, header same, in other, in moment, transparent.

any idea ?? totally out, dont find why happens.

thanks in advance

edit- added image differences

screen shot http://i44.tinypic.com/20u8tj6.png - white texts not transparent.

bad - @ text of button , rigth section, white text "registrarme". white color transparent in both texts.


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