Timed out waiting for ccmexec service to be fully operational

We are deploying Windows 7 in an SCCM 2007 R3 SP2 environment.  Some of the clients we target fail the task sequence with the error, "Timed out waiting for ccmexec service to be fully operational".  Below is the relevant part of the SMSTS.LOG file:

Succeeded loading resource DLL 'C:\Windows\system32\CCM\1033\TSRES.DLL' 
Failed to create an instance of COM progress UI object. Error code 0x80040154 
Timed out waiting for ccmexec service to be fully operational 
0, HRESULT=80004005 (e:\nts_sms_fre\sms\framework\tscore\utils.cpp,4192) 
Failed to wait for Ccmexec service to be fully operational (0x80004005) 

I have seen several posts with this error that say to create the "ConfigMgr Remote Control Users" group.  Here is an example.  We have created this group locally AND on the domain, but we still see this failure on about 10% of clients that we target.  Any other ideas what might be creating this issue?

Thanks,

FP