ドリーで最大まで引いた後（単位が1000000000ｍｍと出るくらいまで引く）、メタボールを２つ作成するとクラッシュします。ちょっと極端なケースですけども。
Metasequoia Ver4.0 Beta3 (64bit) is running.
Build time: Aug 26 2013 10:29:13
Windows version : 6.1 (Windows 7 x64)
Number of CPU : 4
Physical memory : 24519 MB
Direct3D11 Driver: NVIDIA GeForce GTX 680
DeviceID: 4480
SubsysID: 674239586
Revision: 161
Exception code: c0000005 (EXCEPTION_ACCESS_VIOLATION)
Access violation at address 000000007755C360. Write of address 0000000000000000.
Module: E:\WinApl2\Metasequoia4\MSVCR100.dll
0x000000007755C360 MSVCR100.dll: memset + 176 bytes
0x000000013FF404CE Metaseq.exe: MBlobObject::GetTriangles + 3390 bytes, d:\release\metaseq40_beta3\metaseq\mblob.cpp(1852)
0x0000000140058355 Metaseq.exe: RenderBlob + 197 bytes, d:\release\metaseq40_beta3\metaseq\rendd3d11.cpp(2472)
0x0000000140057FF7 Metaseq.exe: D3D11Render + 7831 bytes, d:\release\metaseq40_beta3\metaseq\rendd3d11.cpp(2374) + 34 bytes
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0x000000013FF0C10C Metaseq.exe: TFormMain::Render + 2716 bytes, d:\release\metaseq40_beta3\metaseq\mainform.cpp(3899) + 154 bytes
0x000000013FEE057E Metaseq.exe: MTEventClosureWithArg<TDlgLandscape,MTPaintEventArgs>::invoke + 62 bytes, d:\release\metaseq40_beta3\mtkit\source\mtevent.h(189)
0x000007FECEAADB16 MTKit.dll: MTObject::invokeCallback + 102 bytes
0x000007FECEA5501D MTKit.dll: MTApplication::wndProc + 1229 bytes
0x000007FECEA54B42 MTKit.dll: MTApplication::globalWndProc + 34 bytes
0x0000000076D08971 USER32.dll: GetWindowDC + 129 bytes
0x0000000076D072CB USER32.dll: SetWindowTextW + 631 bytes
0x0000000076D06829 USER32.dll: IsDialogMessageW + 361 bytes
0x0000000076F611F5 ntdll.dll: KiUserCallbackDispatcher + 31 bytes
0x0000000076D03D0A USER32.dll: SetWindowPos + 186 bytes
0x0000000076D027BA USER32.dll: UpdateWindow + 42 bytes
0x000007FECEAD001A MTKit.dll: MTWidget::repaint + 282 bytes
0x000007FECEACFEED MTKit.dll: MTWidget::repaint + 29 bytes
0x000000013FF0B611 Metaseq.exe: TFormMain::RenderTarget + 81 bytes, d:\release\metaseq40_beta3\metaseq\mainform.cpp(3752)
0x000000013FF0A5D0 Metaseq.exe: TFormMain::ExecuteEditCallbackInfo + 2544 bytes, d:\release\metaseq40_beta3\metaseq\mainform.cpp(3327) + 10 bytes
0x000000013FF0ABF0 Metaseq.exe: TFormMain::CanvasMouseDown + 1328 bytes, d:\release\metaseq40_beta3\metaseq\mainform.cpp(3509)
0x000000013FEE057E Metaseq.exe: MTEventClosureWithArg<TDlgLandscape,MTPaintEventArgs>::invoke + 62 bytes, d:\release\metaseq40_beta3\mtkit\source\mtevent.h(189)
0x000007FECEAADB16 MTKit.dll: MTObject::invokeCallback + 102 bytes
0x000007FECEA56113 MTKit.dll: MTApplication::wndProc + 5571 bytes
0x000007FECEA54B42 MTKit.dll: MTApplication::globalWndProc + 34 bytes
0x0000000076D09BD1 USER32.dll: TranslateMessageEx + 673 bytes
0x0000000076D098DA USER32.dll: TranslateMessage + 490 bytes
0x000007FECEA56CF0 MTKit.dll: MTApplication::enterEventLoop + 320 bytes
0x000007FECEA56B9C MTKit.dll: MTApplication::execute + 12 bytes
0x000000013FF5238A Metaseq.exe: wWinMain + 1146 bytes, d:\release\metaseq40_beta3\metaseq\metaseq.cpp(224)
0x00000001400ED322 Metaseq.exe: __tmainCRTStartup + 358 bytes, f:\dd\vctools\crt_bld\self_64_amd64\crt\src\crtexe.c(547) + 36 bytes
0x0000000076E0652D kernel32.dll: BaseThreadInitThunk + 13 bytes
0x0000000076F3C541 ntdll.dll: RtlUserThreadStart + 33 bytes