center image gives bullet

Hi!

I'm trying to make a presentation but when I use a

\begin{center}
\end{center}

or {\center }, the slide gets a bullet, like an item list, something I
surely don't want. can someone give me a hand?

greets,

 Ricardo Reis

 "Non Serviam"

 n.p.: ResonanceFM at http://www.resonancefm.com or (if you're in London) 104.4 FM
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