Only 1 beta is running for me so far -- stuck at 99.415% same as previous poster reported. The first 99% completed in about 5 minutes; then the WU hung.

BOINC 7.0.28
Windows 7 64 bit
AMD Radeon HD 7660D (the GPU component of the A10-5700 Fusion chip)

I Received 7 WU on HD 4890 & HD 4650.
they all resulted in an error.
I think these graphic cards will not support the GPU computing for HCC :(

@ryan222h Thanks. Yes that is happening now for me for some WU. But 14 minutes seems to long for some other WU's.
I wonder if NVIDIA PhysX is the problem.
Windows 7, 2 NVDIA GTX560T1, no SLI disabled, PhysX on CPU

The CPU only versions of HCC standard hold the progress percent for a few minutes at 99.818%. That would be the normal end step applying same to the GPU tasks, when they revert to do the completion on the CPU.

I have now successfully returned two, which are PV.

I shut down BOINC and then rebooted the machine while one was hung at 99.415%. When BOINC came back up, the WU showed 0% completed, and it didn't increment while I was watching. I suspended it and resumed it, and it still wasn't incrementing. However, when I came back 10 minutes later, it had uploaded. The status on the BOINC web page shows three OpenCL initializations.

One other WU ran straight through. I wasn't there to watch how long it hung at 99.415%, but it definitely wasn't as long as the first one had (I came back and it was done after less time than the first one hung). I think whether the BOINC Manager is running may affect the length of the hang.

I just checked, and the one that is currently running has been stuck at 99.415% for 5 minutes.

I am not seeing an effect on runtime or expected runtime of the CFSW units that are running concurrently.