Colour text Bug on wordpress 3.5

ok its happen again the error happen when i scrool sometime the page when i read my article

ok i replied the bug, how to make this bug:

make a colour TEXT exemple “blablabla” with orange colour or other colour
now click send to your keyboard and wirte ” have a nice day ” and click again send and now click backspace button
voilà the colour on “blablabla” turn back to black.

-.-

Have you tried:

– deactivating all plugins to see if this resolves the problem. If this works, re-activate the plugins one by one until you find the problematic plugin(s).

– switching to the Twenty Twelve theme to rule out any theme-specific problems.

– resetting the plugins folder by FTP or PhpMyAdmin. Sometimes, an apparently inactive plugin can still cause problems.

– re-uploading all files & folders – except the wp-content folder – from a fresh download of WordPress. Make sure that you delete the old copies of files & folder before uploading the new ones.

i have tried to do this
but bug error still remain

[No bumping. If it’s that urgent, consider hiring someone.]

I can’t reproduce the problem, the text editor seems to work fine to me. It doesn’t change back to black until I leave the colored section.

i will try to install one native wordpress and try again
tnx Samuel for try

i have try on virgin wordpress 3.5
but its happen again for my opinion we have a bug

I can’t replicate this either.