If you get a wild hatching that appears like an open, you probably have an underlying vector in the offending area. I install all the fonts I'm going to use on the fiber computer and set up in ezcad. I haven't found a better way to ID second layers or opens in ezcad so sometimes it can be a pain to go in and delete or close them. One thing I've noticed is when exporting from Corel, use "none" for hairline border as it exports the outline of the filled image and the hairline border in the same position causing the stacked vector above.