Note: This problem is solved, as far as I'm concerned. I just thought I'd report the symptoms and my workaround. TCMD v11.00.52 TCMD v14.03.59 x64 C: SSD D: HDD I did a dir /s "*something*" on D:\; it worked fine. I did the same on C:\; TCC died. With v11, Windows gave me the "TCC has stopped working" dialog boxes. With v14, the TCC window just vanished with no warning. This behavior was apparently caused by some circular directory pointers. (Darn Windows and its hidden virtual directories!) I had built a new PC, and had to install Windows a couple of times. The second time, I renamed C:\Windows to C:\windows.old, then did the install. When the dir command processed the C:\windows.old directory, I think it went into a loop on these virtual dir pointers. I did a "move /s/a: c:\windows.old d:\windows-old-from-c\", but it also went into a loop (obvious, from the path names it was displaying), and eventually died. A Windows Explorer cut-and-paste of the directory worked fine. After that, I was able to do successful "dir /s" commands on both C:\ and D:\. Comments/criticisms (even of the "you're an idiot" type) are welcomed.