Thanks for your help Rafael.
The following debug log excerpt might provide a clue:
0x0000379C 332161 3 FLASH R: FlashProgrammerUtility::ReadReg() = 1, reg = 0x200003D3
0x0000379C 332161 3 FLASH C: FlashProgrammerUtility::SetBigEndian(1)
0x0000379C 332161 3 FLASH R: FlashProgrammerUtility::SetBigEndian()
0x0000379C 332161 3 FLASH C: FlashProgrammerUtility::SetMemWidth(0)
0x0000379C 332161 3 FLASH R: FlashProgrammerUtility::SetMemWidth()
0x0000379C 332161 3 FLASH C: FlashHercules::CoreTypeLookup(TMS470RDX, 1)
0x0000379C 332161 3 FLASH R: FlashHercules::CoreTypeLookup() = R4_BigEndian
0x0000379C 332161 3 FLASH C: FlashProgrammerUtility::GetPath()
0x0000379C 332161 3 FLASH R: FlashProgrammerUtility::GetPath() = C:\ti\ccsv5\ccs_base\DebugServer\bin\
0x0000379C 332161 3 FLASH C: FlashProgrammerUtility::ReadMem( 0xFFFFFFF0, 0x3A22ED0C, 2, 0 )
0x0000379C 332161 2 CortexR4 GTI C: GTI_READMEM_BLK( 0x3C4D3C38, 0xFFFFFFF0, 0, 0x00000004, 0x00000000, RAM, 0, 0, 0x3DB23B70 )
0x0000379C 332170 2 CortexR4 GTI R: GTI_READMEM_BLK( 0x3C4D3C38, 0xFFFFFFF0, 0, 0x00000004, 0x00000000, RAM, 0, 0, 0x3DB23B70 ) = 0
0x0000379C 332170 3 CortexR4 GTI C: GTI_GETERRSTR_EX3( 0x3C4D3C38, 0x3A22E564, 0x3A22E568, 0x3A22E574, 0x3A22E56C, 0x3A22E580, 0x3A22E578, 0x3A22E57C, 0x3A22E5C4, 64, 0x3A22E604, 1024 )
0x0000379C 332170 3 CortexR4 GTI R: GTI_GETERRSTR_EX3( 0x3C4D3C38, *0x3A22E564 = 0, *0x3A22E568 = 0, *0x3A22E574 = 0x00000000, *0x3A22E56C = 2, *0x3A22E580 = 0x00000000, *0x3A22E578 = 0x00000008, *0x3A22E57C = 0x00000000, , 64, , 1024 ) = 0
0x0000379C 332170 3 FLASH R: FlashProgrammerUtility::ReadMem( 0xFFFFFFF0, 0x3A22ED0C = 363670144, 2, 0 ) = 1
0x0000379C 332170 3 FLASH I: Device ID: 0x15AD2A00
0x0000379C 332178 3 FLASH I: Configuration XML file to use:
0x0000379C 332178 3 FLASH R: FlashHercules Constructor
0x0000379C 332178 3 FLASH I: FlashProgrammerManager::Initialize(), Flash Device interface created successfully.
0x0000379C 332178 3 FLASH C: FlashHercules::FlashAvailable()
0x0000379C 332178 3 FLASH R: FlashHercules::FlashAvailable() = 0
0x0000379C 332178 3 FLASH I: FlashProgrammerManager::Initialize(), Flash is not available on this device.
0x0000379C 332178 3 FLASH R: FlashProgrammerManager::Initialize()
0x0000379C 332178 4 CortexR4 GTI C: GTI_QUERY_INTERFACE( 0x3C4D3C38, IOperationServer, 2, 0x3A22EF9C, 0x3A22EFA4, 0x3A22EFA0, 0x00000000 )
0x0000379C 332179 4 CortexR4 GTI R: GTI_QUERY_INTERFACE( 0x3C4D3C38, IOperationServer, 2, *0x3A22EF9C = 0x00000000, *0x3A22EFA4 = 0x00000001, *0x3A22EFA0 = 0x00000000, *0x00000000 = 0x00000000 ) = -1
0x0000379C 332179 3 LIB C: Locating "GetcToolsDBMgrIFDS" in 3B1E0000
It appears that FlashProgrammerUtility is confused somehow.
-Brad