GFtoPK crashes in supre mode for fonts in certain optical sizes

[Weisser-Kater]

Certain pk files are not produced by GFtoPK, but I get the problem only in supre mode. When I remove this mode, every font works, but the bitmaps are ungly then.

MWE:

\documentclass{article}

\pdfpkmode{supre}
\pdfpkresolution=2400

\usepackage{fonttable}

\begin{document}

\fonttable{ecbx2488}% crashes, works only without supre mode
\fonttable{cmbx25}% crashes, works only without supre mode
\fonttable{cmr25}% crashes, works only without supre mode
\fonttable{cmti25}% crashes, works only without supre mode

\fonttable{cmbx20}% works in standard and supre mode
\fonttable{cmbxti17}% works in standard and supre mode
\fonttable{cmr30}% works in standard and supre mode
\fonttable{cmbxti5}% works in standard and supre mode

\end{document}

So optical sizes about 25 make GFtoPK crash. What is happening here?

[edocevoli]

This is a rounding issue. For example, mf creates cmti25.964gf. But gftopk expects cmti25.965gf.

[Weisser-Kater]

Is there a workaround? Or just wait for a new version without this bug?