gvim display of contents disappears

Hello:

I use gvim on a Scientific Linux 7.3, which in turn runs in a VM under
Windows (Vista).

My problem: occasionally the display of the contents in the gvim window
disappears, leaving a blank space instead. Ctrl-L does not work to
restore the display. However, I've recently found that moving the
cursor in and out of the gvim window, twice, restores the display. I
haven't seen the problem occur with vim, but these days I use gvim much
more.

Moving the cursor over the missing text regions restores the text under
the cursor.

Duplicating this will be difficult as it can possibly depend on so many
things (vista, vmware, x drivers, SL 7.3, etc). Is there enough clue
above to help with this?

Regards,
Chip Campbell

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