Helge Hafting wrote:

> I decided to try preview-latex.  I installed the debian
> package preview-latex-style and turned on the option
> in lyx.  I typed in a math formula, and as soon as
> I hit space (leaving math) the crash happened.
> Lyx created a ppm file on disk with the formula, but I newer saw it
> onm screen.
> Formula $2^{4^{65536}-9^{36}}+57=x^{x}-x^{x^{-x}}$

> Previews generated!
> Previews generated!
> Cache::add(0lyxpreview1.ppm):
> The file must be have an absolute path.

You have found a known bug. The work around is to use a temporary directory 
when using the previews. I'll try and fix the root cause also of course.

-- 
Angus

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