Corrects vertical spacing between title block elements

texinputs/beamerthemetptposter.sty

@@ -73,9 +73,11 @@
        \raisebox{-.01\paperheight}{%
        \begin{minipage}[b][.070\paperheight][c]{.7\paperwidth}
           \begin{center}
+          \vfill{}
           \huge\bfseries\inserttitle\par%
-          \small~\par%
+          \vfill{}
           \large\insertauthor\par
+          \vfill{}
           \small\insertdate
           \end{center}
        \end{minipage}