The sessions connected to Dashboards that are being used to View dashboards are lost when someone else is editing dashboards at the same time.
The issue happens when someone edit a dashboard at the same time it's loading on another screen. This situation raise an exception that kills the w3wp.exe process belonging to Dashboards, closing the active sessions.
You must change the file called web.config located into the Dashboards installation directory in this way:
1) Backup the web.config file (By default located into the path \Program Files\Tango04\Dashboards\web\)
2) Edit the file web.config and search the tag: <compilation debug="true">
3) Replace that line with this new one: <compilation debug="true" numRecompilesBeforeAppRestart="10000">
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