Importing from Sketchup

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This may have been covered before, but I've dad some pecculiar issues importing things made in google sketchup. Sometimes parts of the item modelled are completely missing- for example I might import a table top with no legs, or legs without a tabletop. This tends not to happen if the Collada file (.dae) has been imported into blender and converted into a wavefront (.obj) file, before being imported into DAZ, but there are new problems arising in this case. Sometimes the colours and textures are lost, or partially lost. Sometimes they are only lost in the viewing screen, where a white ghost of the shape is all that can be seen. Sometimes the colours appear as they should if the image is rendered, but not in the main view. Sometimes only some of the colours and textures come through, in block across the surface, and the thing looks like urban camouflage.

Are there identifiablee causes and remedies to these things? Failing that is there an alternative to Sketchup that can be used to create 3d objects and sets that can be imported into DAZ without such problems?