The clue here is "cannot render raw PostScript". Some packages like tikz
and the like draw their images by using many PostScript \special
snippets, and dvipng cannot handle these. Normal included EPS images get
rendered because these do not mix in this manner.
The principal problem is mixing small PostScript snippets with normal
DVI op-codes. I have thought about this, but there is no way to solve
this particular problem without integrating a PostScript interpreter
properly into the internals of dvipng. (The problem is reporting back
the movement of the "cursor" if I remember correctly). Or calling dvips
on the current page, which is a simple but I think suboptimal solution.
If indeed your problem is of this kind, there will be no fix anytime soon.
/JÅ
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