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Wow...by googling this problem in several ways I finally found the way to fix the issue of having the link borders in the navigation bar and in the footer:

\hypersetup{
colorlinks,%
citecolor=black,%
filecolor=black,%
linkcolor=black,%
urlcolor=black
}

However, a final small issue appears, that is ...

Thanks!!

Scribtex works, but I will use that as a last option as I have around 40 slides with figures and it's not practical. It also does not load a package (lucidabr) but it's not crucial.

Alternatively how can I shift back to an older hyperref version using MiKTex? I might also work on linux if ...

hello I have been using beamer for quite a while now and just 2 days before my thesis presentation a weird thing has happened to my presentation, that is there appear some line borders at the navigation bars and footers which I don't know how to remove.

They appear in the simplest slides possible ...