2nd GPU of 4870x2 stays in 2d clocks

I'm using BOINC 6.12.26, Lunatics ap_5.06_win_x86_SSE2_OpenCL_ATI_r456 and Lunatics MB_6.10_win_SSE3_ATI_r177.
My 4870x2 is using Catalyst 11.4 and it seems that during the process of a workunit on the 2nd GPU (AP or MB), the clocks stay at 2d mode (500MHz), when the 1st GPU is at 750MHz as it should be.
Both GPUs were found during BOINC Manager startup with same capabilities.
Possibly is a Catalyst fault, but is there any option to force 3D clocks on the 2nd GPU through app_info.xml or cc_config.xml ?
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