TeXmaker -- startup window disappears

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http://ubuntuforums.org – I've been a happy and experienced user of TeXmaker, on 10.04 and earlier, for many years. I've now upgraded to 12.04 and installed the 12.04 version from the Software Center. After installation, my first attempt to use TeXmaker brought up the usual window containing the latex file. Which, with <F2> seemed to compile normally. On doing <F1> to bring up a display of the .dvi file (which I assumed would have been postscript), however, things went awry. There MIGHT have been a PDF display on the far right side of the window containing the.tex file. But somehow I never really (Hardware)