this sounds like bad xmls in the DB, what's your km version?
if you're using the latest kmeleon, and to make sure it's a gecko thing, test with firefox 2.0 or seamonkey 1.8..if they display the same errors.. that means it;s a gecko problem(mostly there are errors in ebsco xml DB that gecko can not parse: not standard compatible.. that happens when people test or develop for internet explorer which is not using the correct standard for gecko).. there's no way to fix this from kmeleon's part and the errors have to be rectified in the DB itself, and only ebsco can fix..so you did the right thing by contacting their tech support.
if firefox or seamonkey don't have the same errors, then it's weird but this can mean a corrupted chrome (embed.jar).. in that case, reinstalling kmeleon should fix it.
also..if it's the first case, you can use the ie engine in kmeleon for ebsco db by using ietab extension which will most probably allow you access but you will have to enter the ietab chrome address first before the ebsco db url..for example, if their address is ebscohost.db etc you enter the chrome address first followed directly for nabisco url
if you like to test using ietab, download it from either km extensions central or jujuland extensions (if you don't know how to register components, then you should download from jujuland's because it uses a self-installer which automatically register components
km ext central: http://kmext.sf.net