Roundcube 1.6.9 background messages problem

[itlo]

Hello:
I have updated the version of roundcube from 1.6.6 to 1.6.9 and now there are certain html emails that show the background in black when before they were shown in white. This happens in all skins.In version 1.6.6 those emails had a white background. I attach a sample. Any solution please?
Thank you so much.
Regards.