Client on Citrix "not responding" after posting

Some annoying issue with a Navision 3.70B SQL with Citrix Metaframe… after posting, so far just posting general journals, the dialog form freezes at 100% and the navision client on citrix does not respond anymore. The strange thing is that the batch gets posted correctly and other users can access the posted documents normally… the only solutions for the “poster” is to terminate the citrix session and log on again. Though I have seen a couple of topics mentioning the “form freeze” with Citrix, I was wondering if there exists a fix for it… Saludos Nils