Hello, Tom.

Just upgraded my docker to 3.1 yesterday, upgraded fine, except that some books have issue generating the previews with errors like:

20250820 14:18:31 [Scanner thread] WARN o.apache.fontbox.cff.Type1CharString - Unknown charstring command in glyph three of font ULVYYC+UniversLTStd-BoldCn
20250820 14:18:31 [Scanner thread] WARN o.apache.fontbox.cff.Type1CharString - Unknown charstring command in glyph R of font ULVYYC+UniversLTStd-BoldCn
20250820 14:18:31 [Scanner thread] WARN o.apache.fontbox.cff.Type1CharString - Unknown charstring command in glyph R of font ULVYYC+UniversLTStd-BoldCn
20250820 14:18:31 [Scanner thread] WARN o.apache.fontbox.cff.Type1CharString - Unknown charstring command in glyph R of font ULVYYC+UniversLTStd-BoldCn
20250820 14:18:31 [Scanner thread] WARN o.apache.fontbox.cff.Type1CharString - Unknown charstring command in glyph R of font ULVYYC+UniversLTStd-BoldCn
20250820 14:18:31 [Scanner thread] WARN o.apache.fontbox.cff.Type1CharString - Unknown charstring command in glyph A of font ULVYYC+UniversLTStd-BoldCn
20250820 14:18:31 [Scanner thread] WARN o.apache.fontbox.cff.Type1CharString - Unknown charstring command in glyph A of font ULVYYC+UniversLTStd-BoldCn
20250820 14:18:31 [Scanner thread] WARN o.apache.fontbox.cff.Type1CharString - Unknown charstring command in glyph S of font ULVYYC+UniversLTStd-BoldCn
20250820 14:18:31 [Scanner thread] WARN o.apache.fontbox.cff.Type1CharString - Unknown charstring command in glyph S of font ULVYYC+UniversLTStd-BoldCn
20250820 14:18:31 [Scanner thread] WARN o.apache.fontbox.cff.Type1CharString - Unknown charstring command in glyph S of font ULVYYC+UniversLTStd-BoldCn
20250820 14:18:31 [Scanner thread] WARN o.apache.fontbox.cff.Type1CharString - Unknown charstring command in glyph S of font ULVYYC+UniversLTStd-BoldCn
20250820 14:18:31 [Scanner thread] WARN o.apache.fontbox.cff.Type1CharString - Unknown charstring command in glyph S of font ULVYYC+UniversLTStd-BoldCn
20250820 14:18:31 [Scanner thread] WARN o.apache.fontbox.cff.Type1CharString - Unknown charstring command in glyph E of font UFVYYC+MinionPro-Regular

It's okay to read the book afterwards, but I miss the covers :)

Running on Linux in a docker container fyi.

Thanks,

Antoine