we're also seeing this problem here - we've updated the cloud settings on tagul several times recently, adding more black listed words etc - and we also update the pages that we are using to build the cloud from daily. However, we often see that the cloud itself does not update on peoples machines here and the only way to get it to update to the latest settings is to manually clear the cache on those machines.

As our cloud is being built from a collection of articles on our site that we add to each day we'd really like to be sure that it's being rebuilt for everyone viewing the site as and when we update our content (or at the very least once per day when they visit the site)

Can you clarify when and how the cloud is updated for someone viewing it and what might cause a machine to permanently fail to update a cached copy of the cloud?

Currently to us it appears as if the cloud is only built the first time it is viewed and then the cache has to be deleted by the user if they want to force an update?