Ok, if that’s the case maybe it is related to using the same “prog_name”.  That 
definitely wouldn’t help the situation.

I’ll test that change.  Thanks!

David K


> On Sep 26, 2017, at 1:15 PM, Juha Sointusalo <juha.sointus...@gmail.com> 
> wrote:
> 
> Windows only, BOINC version 7.8.2 only? And it's boinc_graphics_make_shmem() 
> that fails?
> 
> If it's 7.8.2 it looks like yet another case of using dirty slot directories. 
> The shared memory segment's name that is really used contains the number of 
> the slot directory. If the segment already exists boinc_graphics_make_shmem() 
> fails. The segment might still be open in graphics app for the previous task 
> using the slot directory.
> 
> The graphics app probably has some file open in the slot directory, like 
> stderr, and that prevented previous client versions from using the slot 
> directory.
> 
> If it's 7.8.2 you'll just have to tell everyone to skip that version.
> 
> -Juha

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