Thanks for the information - I knew about the InstallLog.csv file, this is where I looked first, but the STPatchAssessment.log is new to me.
Looking at the "Windows Compliance by Update" report I see there are 48 applicable, 31 Installed and 17 Not installed computers for "Windows6.1-KB3070738-x64.msu". The computer in question does not appear in the list of applicable computers for this update.
Searching for MS15-069 in STPatchAssessment.log I found the following entry:
2015-08-12T11:00:38.4348423Z 06d0 V PatchTest.cpp:610 Testing 'MS15-069'.
2015-08-12T11:00:38.4348423Z 06d0 V PatchTest.cpp:707 Bulletin 'MS15-069', filecount = 4, regcount = 1.
2015-08-12T11:00:38.4348423Z 06d0 V PatchTest.cpp:1273 File 'C:\Windows\system32\CEWMDM.DLL' error: 0.
2015-08-12T11:00:38.4348423Z 06d0 V PatchTest.cpp:1276 File C:\Windows\system32\CEWMDM.DLL (12.0.7601.18872) C 2 12.0.7601.23075 (AC 5).
2015-08-12T11:00:38.4348423Z 06d0 V PatchTest.cpp:1273 File 'C:\Windows\system32\CEWMDM.DLL' error: 0.
2015-08-12T11:00:38.4348423Z 06d0 V PatchTest.cpp:1276 File C:\Windows\system32\CEWMDM.DLL (12.0.7601.18872) C 2 12.0.7601.18872 (AC 5).
2015-08-12T11:00:38.4348423Z 06d0 V PatchTest.cpp:1290 Is *A* FileChange
2015-08-12T11:00:38.4348423Z 06d0 V PatchTest.cpp:1273 File 'C:\Windows\SysWOW64\CEWMDM.DLL' error: 0.
2015-08-12T11:00:38.4348423Z 06d0 V PatchTest.cpp:1276 File C:\Windows\SysWOW64\CEWMDM.DLL (12.0.7601.18872) C 2 12.0.7601.23075 (AC 5).
2015-08-12T11:00:38.4348423Z 06d0 V PatchTest.cpp:1273 File 'C:\Windows\SysWOW64\CEWMDM.DLL' error: 0.
2015-08-12T11:00:38.4348423Z 06d0 V PatchTest.cpp:1276 File C:\Windows\SysWOW64\CEWMDM.DLL (12.0.7601.18872) C 2 12.0.7601.18872 (AC 5).
2015-08-12T11:00:38.4348423Z 06d0 V PatchTest.cpp:1290 Is *A* FileChange
2015-08-12T11:00:38.4348423Z 06d0 V PatchTest.cpp:735 A file was tested.
2015-08-12T11:00:38.4348423Z 06d0 V PatchTest.cpp:1470 Key 'SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing\Packages\Package_for_KB3067903~31bf3856ad364e35~amd64~~6.1.1.0'.
2015-08-12T11:00:38.4348423Z 06d0 V PatchTest.cpp:1628 Reg passed.
2015-08-12T11:00:38.4348423Z 06d0 V PatchTest.cpp:610 Testing 'MS15-069'.
2015-08-12T11:00:38.4348423Z 06d0 E DynamicProductDetection.cpp:2177 *** Error *** in COMPARE. Could not find VarName1 'CurrentState'. Detection of this product may be in error as a result.
2015-08-12T11:00:38.4348423Z 06d0 V PatchTest.cpp:1113 Return[DOES NOT APPLY] Message[]
2015-08-12T11:00:38.4348423Z 06d0 V PatchTest.cpp:653 NOT testing 'MS15-069' - patch script said it did not apply.
The file tested, CEWMDM.DLL, is a component of the patch for KB3067903, but I'm not sure if the other patches are tested for some reason. Updates listed for MS15-069 are:
Windows6.1-KB3067903-x64.msu
Windows6.1-KB3067903-x86.msu
Windows6.1-KB3070738-x64.msu
Windows8.1-KB3061512-x64.msu
I'm not sure if this update is failing to install on any other computers at the moment.