Sigh, that must be it. This machine is just creaky enough to hit the aluminum ceiling: i'm trapped at 10.6.8 (Core Duo, not Core 2 Duo).
Well thank you once more for your attention. I'm wowed, to say the least, with your responsiveness and look forward to giving this another go, once I drag myself out of 2006.
Be well
PS here are the crashy bits from the log:
Exception Type: EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes: 0x0000000000000001, 0x0000000000000000
Crashed Thread: 9
...
Thread 9 Crashed:
0 libJRImage.dylib 0x1b02b30e 0x1b000000 + 176910
1 libJRImage.dylib 0x1b02b831 0x1b000000 + 178225
2 com.jriver.MediaCenter18 0x002b6dad start + 2834765
3 com.jriver.MediaCenter18 0x002b6b1d start + 2834109
4 com.jriver.MediaCenter18 0x002ba56a start + 2849034
5 com.jriver.MediaCenter18 0x002bc1f3 start + 2856339
6 com.jriver.MediaCenter18 0x0044414c start + 4461804
7 libSystem.B.dylib 0x01776259 _pthread_start + 345
8 libSystem.B.dylib 0x017760de thread_start + 34
Thread 9 crashed with X86 Thread State (32-bit):
eax: 0x0000000b ebx: 0x00000003 ecx: 0x00000000 edx: 0x00000005
edi: 0x00000003 esi: 0x1b02b20b ebp: 0xb043fa28 esp: 0xb043f910
ss: 0x0000001f efl: 0x00210206 eip: 0x1b02b30e cs: 0x00000017
ds: 0x0000001f es: 0x0000001f fs: 0x0000001f gs: 0x00000037
cr2: 0xffe2a3cc