Finally i got Multitail to work. The only problem is the Default Colorscheme isn't applied to a file i open with multitail, so have to go to the menu and apply it manually.
My multitail.conf looks like this
#test defaultcscheme:test colorscheme:test: my test colorscheme cs_re_s:white,black,bold/blink:([^:]*): SRC
What's the reason?