Only with this project (GPUGrid), when gpus have each 1 task(1 GTX285 + 1 GTX295 on a Q6600 computer), my cpu have only three tasks in place of four.
On Milkyway, this problem doesn't exist, 3 gpus tasks for four cpu tasks.
It's very strange.

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When only two of my three gpus are on GPUGrid, I retrieve my four CPU tasks ( 2 gpu tasks on GPUGrid, one gpu task on Milkyway and four cpu tasks on QMC@Home).

Same problem with boinc version 6.10.24, 6.10.19 and 6.10.17.
It's very strange.
However, no problem at all with the following projects : Milkyway@Home, PrimeGrid (AP26 search).

Same problem with boinc version 6.10.24, 6.10.19 and 6.10.17.
It's very strange.
However, no problem at all with the following projects : Milkyway@Home, PrimeGrid (AP26 search).

Another boinc project known as Collatz Conjecture doesn't have this problem too.
I remove this computer from the project to let you some time to find a fix.
To finish, Boinc version 6.10.32 doesn't fix the problem.