Few (or many?) of projects, which allow to selectively opt-in/out for 
each single applications, have one more optional checkbox to 
automatically opt-in for "each new application, which will be added by 
the project at some later time" for a particular venue. This way the 
user is guaranteed to get some work, even if his presently opted-in apps 
will be phased out. (I have no idea, whether this checkbox' code comes 
from BOINC trunk, or is being individually added by these projects.)

Users, who would like to manually tailor their used set of apps, may 
simply keep this checkbox unchecked.

And the notification does indeed work using notices - "No work is 
available for the apps you've chosen. Please check your project 
setttings on its web page."


Peter Slacik


Bernd Machenschalk wrote:
> Hi!
>
> We just stumbled upon a major problem with the app selection mechanism in 
> BOINC:
>
> - when a user edits his project preferences to e.g. opt-out of an 
> application, all applications that he wants to run and that are known AT THAT 
> TIME are added to the project preferences
> - when a new application is added to the project, this appid is not 
> automatically added to the project settings of any user/venue
> - this means that the user will not get any work for new applications until 
> he edits his preferences again
>
> For projects that regularly phase applications in and out this means that 
> sooner or later no user that ever opted out of an application will ever get 
> work from the project, without knowing why, withot being notified of it and 
> possibly without recognizing it.
>
> [...]
>
> Best,
> Bernd
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