KCW - errors in Flashtracer

Hi you should know - the KCW throws errors if you have installed the dev version of flashplayer and flash tracer.
The uploading etc. works, but it seems that there a few errors in code...

Error #2044: securityError unverarbeitet. text=Error #2048: Verletzung der Sicherheits-Sandbox: http://xxxx.xxx.xx/kalturaCE/p/1/sp/0/flash/kcw/v1.0_roB_de/Contribution... kann keine Daten von https://mydomain.de/?q=kaltura/notification_handler laden.
at com.kaltura.contributionWizard.command::SendPartnerNotificationsCommand/sendNotification()
at Array$/_forEach()
at Array/http://adobe.com/AS3/2006/builtin::forEach()
at com.kaltura.contributionWizard.command::SendPartnerNotificationsCommand/execute()
at com.adobe_cw.adobe.cairngorm.control::FrontController/executeCommand()
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at com.adobe_cw.adobe.cairngorm.control::CairngormEventDispatcher/dispatchEvent()
at com.adobe_cw.adobe.cairngorm.control::CairngormEvent/dispatch()
at com.kaltura.contributionWizard.command::AddEntriesCommand/result()
at com.kaltura.contributionWizard.business::AddEntriesDelegate/result()
at mx.rpc::AsyncToken/http://www.adobe.com/2006/flex/mx/internal::applyResult()
at mx.rpc.events::ResultEvent/http://www.adobe.com/2006/flex/mx/internal::callTokenResponders()
at mx.rpc.http.mxml::HTTPService/http://www.adobe.com/2006/flex/mx/internal::dispatchRpcEvent()
at mx.rpc::AbstractInvoker/http://www.adobe.com/2006/flex/mx/internal::resultHandler()
at mx.rpc::Responder/result()
at mx.rpc::AsyncRequest/acknowledge()
at DirectHTTPMessageResponder/completeHandler()
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at flash.net::URLLoader/onComplete()