During running AaH the desktop was very sticky, most time I had to wait some seconds before any activity could be performed. This was also during the phases of waiting of the AaH task. The desktop was no longer sticky when the AaH project was suspended. This is a very uncomfortable way of operation.

... but caused by the graphics card interfering with your regular display and is not a defect by albert@home from what I grasp.

This wu seems to be wreaking havoc. I completed it ok, but everyone is erroring out. Your client erorred too Bikeman, but I presume that is because you client is 6.12.33?

http://albert.phys.uwm.edu/workunit.php?wuid=69493

...

Hardware: Desktop-GPU, ATI Radeon HD5450, 1024 MB DDR3, (650/800Mhz)
Software: Catalst 12.3, BOINC 7.0.26 (x64), Windows 7/64
RAM-Usage: Taskmanager during GPU-process: ~207 MB (max)
no visible GPU-Usage (by AMD Overdrive), computing the workunits took just same seconds until fail
Each workunit failed, so I stopped processing.

Stderr output

<core_client_version>7.0.26</core_client_version>
<![CDATA[
<message>
Beim L�schen der Farbtransformation ist ein Fehler aufgetreten. (0x7e3) - exit code 2019 (0x7e3)
</message>
<stderr_txt>
Activated exception handling...
[20:24:32][5108][INFO ] Starting data processing...
[20:24:33][5108][INFO ] Using OpenCL platform provided by: Advanced Micro Devices, Inc.
[20:24:33][5108][INFO ] Using OpenCL device "Cedar" by: Advanced Micro Devices, Inc.
[20:24:34][5108][WARN ] Kernel "kernelTimeSeriesMeanReduction" exceeds device-specific maximum work group size (requested: 256)!
------> Reducing kernel's work group size to allowed maximum of: 128 work items
[20:24:34][5108][WARN ] Kernel "kernelPowerSpectrum" exceeds device-specific maximum work group size (requested: 256)!
------> Reducing kernel's work group size to allowed maximum of: 128 work items
[20:24:34][5108][WARN ] Kernel "kernelHarmonicSumming" exceeds device-specific maximum work group size (requested: 256)!
------> Reducing kernel's work group size to allowed maximum of: 128 work items
[20:24:35][5108][INFO ] Checkpoint file unavailable: status.cpt (No such file or directory).
------> Starting from scratch...
[20:24:35][5108][INFO ] Header contents:
------> Original WAPP file: ./p2030.20110421.G41.29-00.40.S.b0s0g0.00000_DM42.40
------> Sample time in microseconds: 65.4762
------> Observation time in seconds: 274.62705
------> Time stamp (MJD): 55672.400301627786
------> Number of samples/record: 0
------> Center freq in MHz: 1214.289551
------> Channel band in MHz: 0.33605957
------> Number of channels/record: 960
------> Nifs: 1
------> RA (J2000): 190804.6872
------> DEC (J2000): 71149.1882019
------> Galactic l: 0
------> Galactic b: 0
------> Name: G41.29-00.40.S
------> Lagformat: 0
------> Sum: 1
------> Level: 3
------> AZ at start: 0
------> ZA at start: 0
------> AST at start: 0
------> LST at start: 0
------> Project ID: --
------> Observers: --
------> File size (bytes): 0
------> Data size (bytes): 0
------> Number of samples: 4194304
------> Trial dispersion measure: 42.4 cm^-3 pc
------> Scale factor: 0.00758342
[20:24:40][5108][INFO ] Seed for random number generator is 1157054464.
[20:25:10][5108][INFO ] Derived global search parameters:
------> f_A probability = 0.08
------> single bin prob(P_noise > P_thr) = 1.32531e-008
------> thr1 = 18.139
------> thr2 = 21.241
------> thr4 = 26.2686
------> thr8 = 34.6478
------> thr16 = 48.9581
[20:25:10][5108][ERROR] Error during OpenCL kernel setup: PS_R3 (error: -55)
[20:25:10][5108][ERROR] Demodulation failed (error: 2019)!
20:25:10 (5108): called boinc_finish

</stderr_txt>
]]>

ATI 4850(512MB) no tasks.

ATI 5850(1024) running with 0.94cpu and 0.5gpu alongside a milkyway task.
progress of task is 44% and ticking.