RTF to PDF conversion - losing table colour

I have an RTF file created in Word 11 that has a table in it with coloured cells.

When I convert that to a PDF with the online tool (Convert A File Word, PDF, JPG Online), the table colouring is preserved.

When I do the same using the Aspose.Words.dll version 25.4.0 (I wrote a small utility to call that), the table colouring is lost on conversion to PDF.

What am I doing wrong?

Background:
I have an older RTF file created in Word 10 with a table with coloured cells. This converts to a PDF with no issues using Aspose.Words.dll version 2014.11.30, but this version fails when the RTF file is subsequently edited in Word 11, hence the attempted upgrade.

The Word 10 version is still correct when converted to PDF with version 25.4.0

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