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We have a BI Dashboard where Global (&&) variables are important. It seems like if we leave the screen open for some period of time with no interaction on the dashboard, and then click a link to run a fex, the global variables no longer exist. But the fact that we woke something up by running that fex seems to make the variables available to subsequent requests.
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It has been a while, but the globals are stored in a file in the temp directory of the client installation. The _TempFileTimeout is defaulted to 900 seconds. That means that the global variable file is then deleted after 900 seconds after it is created. The global file is re-created every time you run a request. However, after 15 minutes of inactivity, it would be deleted. I believe that if you change that value to the same number as the session timeout, then you might stop this.
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