OSはwin7 64bitです。
メタセコイアを再インストールしてまた試したのですがｸﾗｯｼｭﾛｸﾞﾌｧｲﾙが溜まるばかり…。
Metasequoia 4 Ver4.5.6 (64bit) is running.
Build time: Jun 9 2016 18:06:32
Windows version : 6.1 (Windows 7 x64)
Number of CPU : 8
Physical memory : 16384 MB
Direct3D11 Driver: NVIDIA GeForce GTX 660
DeviceID: 4544
SubsysID: 678499426
Revision: 161
FeatureLevel: 11.0
Exception code: c0000005 (EXCEPTION_ACCESS_VIOLATION)
Access violation at address 000007FEE8323ECE. Read of address 0000000000000004.
Module: C:\Windows\system32\nvwgf2umx.dll
0x000007FEE8323ECE nvwgf2umx.dll: NVAPI_Thunk + 3019998 bytes
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0x000007FEE8322486 nvwgf2umx.dll: NVAPI_Thunk + 3013270 bytes
0x000007FEE82A0913 nvwgf2umx.dll: NVAPI_Thunk + 2481955 bytes
0x000007FEE82B835F nvwgf2umx.dll: NVAPI_Thunk + 2578799 bytes
0x000007FEE828C894 nvwgf2umx.dll: NVAPI_Thunk + 2399908 bytes
0x000007FEE828B7C7 nvwgf2umx.dll: NVAPI_Thunk + 2395607 bytes
0x000007FEE825083F nvwgf2umx.dll: NVAPI_Thunk + 2154063 bytes
0x000007FEE82019FB nvwgf2umx.dll: NVAPI_Thunk + 1830923 bytes
0x000007FEE7FF3C87 nvwgf2umx.dll: OpenAdapter10 + 851751 bytes
0x000007FEE7F2955A nvwgf2umx.dll: OpenAdapter10 + 22522 bytes
0x000007FEE803B1A5 nvwgf2umx.dll: OpenAdapter10 + 1143877 bytes
0x000007FEE8042582 nvwgf2umx.dll: OpenAdapter10 + 1173538 bytes
0x000007FEE80424BF nvwgf2umx.dll: OpenAdapter10 + 1173343 bytes
0x000007FEE876A443 nvwgf2umx.dll: NVAPI_Thunk + 7502419 bytes
0x000007FEE876A4D7 nvwgf2umx.dll: NVAPI_Thunk + 7502567 bytes
0x00000000776359CD kernel32.dll: BaseThreadInitThunk + 13 bytes
0x000000007786A2E1 ntdll.dll: RtlUserThreadStart + 33 bytes
とでます。