Could you please check ondataupdate function in custom symbol. Looks like it is not refreshed as soon as change was done. You can debug the same in your test region by setting in debug mode and use developer tool of brower (chrome 12) --> navigate to custom symbol and use debug points to check how frequently you are hitting the update of your custom symbol.
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I believe this is expected. These attributes which are not PI Point Data References are subject to the AF caching settings of PI Vision. I believe the default is two minutes. You can force these attributes to update at the same frequency as everything else by updating a pair of settings in your web.config file.
<add key="AFCacheUpdateTimer" value="5"/>
<add key="AFUpdateTimeOut" value="0"/>
the AFCacheUpdateTimer will affect <None>, Table Lookup, and Formula DRs. The AFUpdateTimeOut of 0 is needed to force Analysis DRs to update at the 5 second refresh rate.
Thanks, works for me!