Hello,
There were no changes between version 19 and 20 that would cause textures to be lost when exported to SketchUp format (I tried it really quick and it works just fine for me). If you experience this with one of your files, I suggest you to contact your local support for help, as this might be an issue with your project file.
Regarding grouping: separate elements are now grouped together after export, as in most cases it is much easier to handle like this. If you don't like this, you can just select everything in SketchUp after export, and explode them with a single click of a button.
Regards,
Daniel Alexander Kovacs
Professional Services Consultant
GRAPHISOFT
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