I have problems with importing KML to Google Mpas, there are no problems with point features, but if KML contains lines or polygons importer does not work, there is the same problem with Google Maps plugin for Joomla CMS. Does anyone know the solvation of this problem, or I must not hope?

It may be reaching a limit on the number of vertices in the polys that you're trying to import (into a My Map, I assume). What's the URL to your KML file? Upload to google pages if its on your hard drive.

I have uploaded it to google pages and tried to import from URL, but there has been the same problem.

As for vertices, I think you are right. The same happened to points: only 200 points were uploaded from 500.

Maybe there is limitation of 200 vertices too?

Sho – Please link to the KML here so I can see for myself.
Thanks!