I have an Apogee Duet and am experiencing the same problem.
The install of Fusion 6 crashes every time at the “Welcome to VMware Fusion!” licence page (have tried several times).
If I UNPLUG the duet, then all works as expected.
The Apple crash log also specifically mentions a USB issue (first few entries listed below)
Best regards
Process: VMware Fusion [2715]
Path: /Applications/VMware Fusion.app/Contents/MacOS/VMware Fusion
Identifier: com.vmware.fusion
Version: 6.0.0 (1296151)
Code Type: X86-64 (Native)
Parent Process: launchd [171]
User ID: 501
Date/Time: 2013-09-10 09:37:59.820 +0100
OS Version: Mac OS X 10.8.4 (12E55)
Report Version: 10
Interval Since Last Report: 62815 sec
Crashes Since Last Report: 3
Per-App Interval Since Last Report: 31 sec
Per-App Crashes Since Last Report: 3
Anonymous UUID: 4CCD9F50-1F3B-70DE-2072-406A502A3C6E
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x00007fff91aa9d46 __kill + 10
1 libvmwarebase.dylib 0x0000000108ed0422 0x108a3f000 + 4789282
2 libvmwarebase.dylib 0x0000000108ecf7e7 0x108a3f000 + 4786151
3 libvmwarebase.dylib 0x0000000108ecf70b Sig_CoreDump + 11
4 libvmwarebase.dylib 0x0000000108a84f37 Panic_Panic + 151
5 libvmwarebase.dylib 0x0000000108a85082 Panic + 130
6 libvmwareui.dylib 0x00000001094d874d cui::USBDeviceRule::USBDeviceRule(unsigned int, long long, utf::string const&, utf::string const&, utf::string const&) + 1389
7 libvmwareui.dylib 0x00000001094d5ac4 cui::USBDeviceMgr::USBArbRuleEnumCallback(unsigned int, unsigned int, unsigned int, long long, char const*, char const*, char const*, UsbArbLibHandle*, void*) + 228
8 libvmwarebase.dylib 0x0000000108d50b53 0x108a3f000 + 3218259
9 libvmwarebase.dylib 0x0000000108aff597 AsyncSocketFillRecvBuffer + 247
10 libvmwarebase.dylib 0x0000000108b01001 0x108a3f000 + 794625
11 com.vmware.fusion 0x00000001079dccac 0x1078cf000 + 1105068
12 com.vmware.fusion 0x00000001079dcb63 0x1078cf000 + 1104739
13 com.apple.CoreFoundation 0x00007fff862b6fa5 __CFSocketPerformV0 + 1045
14 com.apple.CoreFoundation 0x00007fff86277b31 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
15 com.apple.CoreFoundation 0x00007fff86277455 __CFRunLoopDoSources0 + 245
16 com.apple.CoreFoundation 0x00007fff8629a7f5 __CFRunLoopRun + 789
17 com.apple.CoreFoundation 0x00007fff8629a0e2 CFRunLoopRunSpecific + 290
18 com.apple.HIToolbox 0x00007fff879c4eb4 RunCurrentEventLoopInMode + 209
19 com.apple.HIToolbox 0x00007fff879c4c52 ReceiveNextEventCommon + 356
20 com.apple.HIToolbox 0x00007fff879c4ae3 BlockUntilNextEventMatchingListInMode + 62
21 com.apple.AppKit 0x00007fff87fa5533 _DPSNextEvent + 685
22 com.apple.AppKit 0x00007fff87fa4df2 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 128
23 com.apple.AppKit 0x00007fff881ef659 -[NSApplication _realDoModalLoop:peek:] + 485
24 com.apple.AppKit 0x00007fff881ef91e -[NSApplication runModalForWindow:] + 120
25 com.vmware.fusion 0x00000001078f4f5f 0x1078cf000 + 155487
26 com.vmware.fusion 0x00000001078dc0fc 0x1078cf000 + 53500
27 com.apple.CoreFoundation 0x00007fff862aaeda _CFXNotificationPost + 2554
28 com.apple.Foundation 0x00007fff8ea1b7b6 -[NSNotificationCenter postNotificationName:object:userInfo:] + 64