I can't see how re-installation of BOINC will fix OpenCL
Unless you also changed the driver for your ATI Radeon HD 5670

All computed tasks so far are from CPU:
http://setiathome.berkeley.edu/results.php?hostid=7832837&offset=0&show_names=0&state=4&appid=
http://setiathome.berkeley.edu/results.php?hostid=7832837&offset=0&show_names=0&state=2&appid=


All "opencl_ati_mac" tasks are shown still "In progress" on the web:
http://setiathome.berkeley.edu/results.php?hostid=7832837&offset=0&show_names=0&state=1&appid=

Until some of them finish OK it is uncertain if the OpenCL driver is fixed.
Because the problem was the computing on ATI Radeon HD 5670 - not on CPU
http://setiathome.berkeley.edu/result.php?resultid=4536956575

If the problem with OpenCL ("CL build failure") persists - you may try to delete the generated *.bin* files from SETI@home directory (<BOINC_Data>\projects\setiathome.berkeley.edu\)

Which driver version do you use for ATI Radeon HD 5670
Where the driver comes from? (ATI AMD, Apple, video card vendor?)


You may try to find some utility to test OpenCL on Mac:
https://www.google.com/#q=opencl+test+mac

LuxMark is good/safe but I used it only on Windows (I don't have Mac)
http://www.luxrender.net/wiki/LuxMark

There is version for "MacOS 64bit"
http://www.luxrender.net/wiki/LuxMark#LuxMark_v3.0

I used older LuxMark v2 (on Windows 32bit)
http://www.luxrender.net/wiki/LuxMark_v2
http://www.luxrender.net/wiki/LuxMark_v2#Download

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- ALF - "Find out what you don't do well ..... then don't do it!" :)