An .eps file can be Raster or Vector (a bit confusing, eh?) But GoMedia's files should all be vector. Some errors are related to the fact of whether Corel or Adobe were used to create them. For example, if Adobe CS3 was used to create the file, and not saved down to a lower version, then Corel may not recognise it because it is the latest version. You should email GoMEdia and ask them, they should be able to help.