Performance point not working correctly in a SharePoint site

After running a script from the security team that changes files permissions and also isn开发者_运维百科talls some hotfixes, performance point stopped working on my SHarePoint site. The Dashboard Viewer web part does not show the background of a graph we use, and when adding a new web part of this kind into the page the image icon of it does not appear in the web part list.

Any idea of what folder I should give access to and what user? I believe it has to do with file permissions.

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The error happened because UrlScan was installed on the server and Microsoft.PerformancePoint.Scorecards.WebParts directory contains dots in its name. I modified UrlScan config file to let it allow dots in the URL and it started working again.