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after installing, ITunes not playing properly. Skips, drags. How to repair?

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ITunes dragging, skipping. Even IHeart radio cuts out, cracks up, then plays for a minute. Not allowing me to buffer any online radio stations. Only does this when scrolling a page. Doesn't do it on videos.

ITunes dragging, skipping. Even IHeart radio cuts out, cracks up, then plays for a minute. Not allowing me to buffer any online radio stations. Only does this when scrolling a page. Doesn't do it on videos.

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Please check if all your plugins are up-to-date. To do this, go to the Mozilla Plugin Check site.

Once you're there, the site will check if all your plugins have the latest versions. If you see plugins in the list that have a yellow Update button or a red Update now button, please update these immediately.

To do so, please click each red or yellow button. Then you should see a site that allows you to download the latest version. Double-click the downloaded file to start the installation and follow the steps mentioned in the installation procedure.