I believe I have found a bug. While attempting a push/pull on a complex shape, the application entered an infinite loop, taking nearly 50% of the CPU time. I am running an older Toshiba Satellite laptop with recently updated Windows XP. Breaking in with MS Studio 2008 only let me confirm that memory is constantly being allocated and freed. Using MS Process Explorer, I took the following snapshots of the process…

Thread using CPU

SketchUp!OGRCoordinateTransformation::operator=+144496

Re-occuring thread activity

ntoskrnl.exe!ZwAlertThread+0x28
ntoskrnl.exe!SeAssignSecurityEx+0x13d
ntdll.dll!tan+0xfb

ntoskrnl.exe!ZwAlertThread+0x28
ntoskrnl.exe!SeAssignSecurityEx+0x13d
SketchUp.exe!OGRSpatialReference::GetReferenceCount+0x47e47
SketchUp.exe!OGRSpatialReference::GetRoot+0x171d0

ntoskrnl.exe!ZwAssignProcessToJobObject+0x15
ntoskrnl.exe!IoPageRead+0xaf0
hal.dll!HalClearSoftwareInterrupt+0x342
SketchUp.exe!OGRSpatialReference::GetReferenceCount+0x47e47
SketchUp.exe!OGRSpatialReference::GetRoot+0x171d0

ntoskrnl.exe!ZwAssignProcessToJobObject+0x15
ntoskrnl.exe!IoPageRead+0xaf0
hal.dll!HalClearSoftwareInterrupt+0x342
SketchUp.exe!pp_ctcodes+0x4c56a
SketchUp.exe!OGRSpatialReference::GetRoot+0x171d0

ntoskrnl.exe!ZwAssignProcessToJobObject+0x15
ntoskrnl.exe!IoPageRead+0xaf0
hal.dll!HalClearSoftwareInterrupt+0x342
ntdll.dll!RtlFreeHeap+0x16a
ntdll.dll!RtlFreeHeap+0x114
MSVCR80.dll!free+0xcd
SketchUp.exe!pp_ctcodes+0x413c6
SketchUp.exe!OGRCoordinateTransformation::operator=+0x1445c8

ntoskrnl.exe!ZwAssignProcessToJobObject+0x15
ntoskrnl.exe!IoPageRead+0xaf0
hal.dll!HalClearSoftwareInterrupt+0x342
ntdll.dll!RtlAllocateHeap+0x27
MSVCR80.dll!malloc+0x7a

I hope the above helps you track down the bug.