Can´t open certain Videos in Safari

Hello friends,

I use safari 9 on OS X 10.11 and i have an issue concerning videos. On most pages the flash player works on others not, e.g. nba.com. As i´ve already posted in a mozilla forum, I´ve already tried to: delete reinstall the browser, all extensions, add ons, all plugins, delete the cache and history and so on. Nothing worked. My best guess is, that I installed a malware which effects Safari and Firefox, since the same problems occur on both. The only browser that can play every video is Chrome, which I downloaded after the issue began, but I hate it. I´d like to go back using Safari...

Now I installed the debugger flash player which shows me following errors, trying to open

"http://watch.nba.com/video/teams/pacers/2015/10/13/1444751614176-vogel.f4v-55241 ?tab=3"

It shows: An Action Scripts error occured: Error: Error #2134: Cannot create SharedObject. at flash.net::SharedObject$/getLocal() at neulion.iptv.pc.ui::BasePlayerAdaptive2/initCC() at neulion.iptv.pc.ui::BasePlayerAdaptive2/listenInit() at neulion.iptv.pc.ui::BasePlayerAdaptiveChromecast/listenInit() at nba.iptv.pc.ui.player::VodPlayer/listenInit() at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at mx.core::UIComponent/dispatchEvent() at mx.core::UIComponent/set processedDescriptors() at mx.core::Container/createComponentsFromDescriptors() at mx.core::Container/createChildren() at mx.core::UIComponent/initialize() at mx.core::Container/initialize() at nba.iptv.pc.ui.player::VodPlayer/initialize() at mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::childAdded() at mx.core::Container/http://www.adobe.com/2006/flex/mx/internal::childAdded() at mx.core::Container/addChildAt() at mx.core::Application/addChildAt() at mx.core::Container/addChild() at mx.core::Container/createComponentFromDescriptor() at mx.core::Container/createComponentsFromDescriptors() at mx.core::Container/createChildren() at mx.core::UIComponent/initialize() at mx.core::Container/initialize() at mx.core::Application/initialize() at vod/initialize() at mx.managers.systemClasses::ChildManager/childAdded() at mx.managers.systemClasses::ChildManager/initializeTopLevelWindow() at mx.managers::SystemManager/initializeTopLevelWindow() at mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/internal::kickOff() at mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/internal::preloader_completeHandler() at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at mx.preloaders::Preloader/timerHandler() at flash.utils::Timer/_timerDispatch() at flash.utils::Timer/tick() and

TypeError: Error #1009: Cannot access a property or method of a null object reference. at vod/getCurrentBitRateVODValue() at vod/getPublishPointBitrate() at vod/playVideoAfterAd() at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at mx.core::UIComponent/dispatchEvent() at neulion.iptv.pc.ads.player::BasePlayerGIMAAd/listenAdComplete() at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at mx.core::UIComponent/dispatchEvent() at neulion.iptv.pc.ads::NLGIMAAdPlayer/listenAdComplete() at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at MethodInfo-12500() at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at com.google.ads.ima.formats.common::AdsManagerImpl/dispatchEvent() at com.google.ads.ima.common::DeferredEventDispatcher/dispatchAllDeferredEvents() at com.google.ads.ima.formats.common::AdsManagerImpl/adEventHandler() at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at com.google.ads.ima.formats.common.video::VideoAdImpl/adCompleteHandler() at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at com.google.ads.ima.formats.vast.ui::AbstractVideoAdRenderer/redispatchHandler() at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at com.google.ads.ima.formats.common.video::YouTubeChromelessPlaybackEventsSource/ handleVideoComplete() at com.google.ads.ima.formats.common.video::YouTubeChromelessPlaybackEventsSource/ videoCompleteHandler() at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at com.google.ads.ima.formats.common.video::YouTubeChromelessPlaybackImpl/playerSt ateChangeHandler() at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at com.google.youtube.swfproxy::SwfProxy/onExternalEvent() at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at com.google.youtube.model::YouTubeEnvironment/broadcastExternal() at com.google.youtube.application::VideoApplication/setExternalState() at com.google.youtube.application::VideoApplication/onAfterMediaEnd() at com.google.youtube.application::WatchPageVideoApplication/onAfterMediaEnd() at com.google.youtube.application::VideoApplication/onEndScreenEnter() at com.google.youtube.application::WatchPageVideoApplication/onEndScreenEnter() at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at com.google.youtube.time::CueRangeManager/handleCueRangeEvents() at com.google.youtube.time::CueRangeManager/internalSync() at com.google.youtube.time::CueRangeManager/sync() at com.google.youtube.time::CueRangeManager/onPlayerStateChange() at com.google.youtube.application::VideoApplication/onVideoStateChange() at com.google.youtube.application::WatchPageVideoApplication/onVideoStateChange() at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at com.google.youtube.players::BaseVideoPlayer/setPlayerState() at com.google.youtube.players::HTTPVideoPlayer/setPlayerState() at com.google.youtube.players::TagStreamPlayer/setPlayerState() at com.google.youtube.players::BaseVideoPlayer/end() at com.google.youtube.players::BaseVideoPlayer/onProgress() at com.google.youtube.players::HTTPVideoPlayer/onProgress() at com.google.youtube.players::TagStreamPlayer/onProgress() at com.google.utils::Scheduler/dispatchEvent() at com.google.utils::Scheduler$/run() at Function/http://adobe.com/AS3/2006/builtin::apply() at com.google.youtube.application::VideoApplication/guardedCall()

Any ideas? This is driving me insane.