We have a multiple tab screens in a review harness to show information about work object. We believed it is a better performance to use "Defer load contents" in each tab, because Pega will not load contents until operator actually clicks on that tab. However with this setting on, recently we found that sometimes even when we click each tab, system won't load contens (i.e. it does not render anything). If I turn off Defer load contents, it works stably. I used Tracer, logs, Fiddler for debugging but could not find any error. Is this function really stable? If not, I will stop using it so please let me know if anyone has any clue.