When I downloaded and updated MiKTeX 2.9 portable and try to change the paper size to
lettersize under options, everything works fine. The paper size changes as desired but as soon as check for updates, it says that
miktex-dvipdfm-base-2.7 miktex-dvipdfmx-base-2.7 miktex-dvips-base miktex-pdftex-base-2.9
needs to be repaired. If I do the update the paper size is switched A4 size again. The story repeats again if change back to letter size. Why is this happening and can this be fixed?