Srinivas Nedunuri wrote:
I did notice that under converters, there was no converter for Lyx to Dvi, in fact anything to Dvi...which might be the source of the problem though I'm baffled as to how it disappeared if indeed there ought to be one
There is no direct converter from LyX to DVI. What you need is a converter from LyX to LaTeX and a converter from LaTeX to DVI.
First thing to check: File->Export has an entry for LaTeX. If not, something has either hosed your LaTeX installation or made it appear to LyX to be unavailable.
Second thing to check: Edit->Preferences->File formats should include entries for LaTeX and DVI. The DVI entry needs to have a viewer specified (probably yap if you're using MiKTeX). The LaTeX entry need not have a viewer specified; you can use any text editor/viewer (e.g., notepad) if you want to be able to view LaTeX files produced by LyX.
Third thing to check: Edit->Preferences->Converters needs a path from LaTeX to DVI. (LyX to LaTeX is automatically available and is not listed in the Converters section.) In recent versions, this path has two elements: a LaTeX to DraftDVI entry (the converter is latex $$i), and a DraftDVI to DVI entry (python $$s/scripts/clean_dvi.py $$i $$o). With just the first entry, you should have DraftDVI available on the View menu.
Paul