Hi, I run tcc version 13.04.58 on Windows 8.1 but I reproduced this problem with version 20.11.40. TCC 20.11.40 x64 Windows 8.1 [Version 6.3.9600] [i:\home\jhm\arc]services.msc [i:\home\jhm\arc]exit Using Sysinternals process explorer, I notice after executing the "exit" command or clicking on the TCC window's X, tcc.exe terminates but the conhost.exe child does not. The TCC window disappears and the conhost.exe process terminates when either the mouse clicks the TCC window's X a second time or if the child process (mmc.exe in this case) terminates. If the TCC window has no child process other than conhost.exe, the TCC window disappears after typing exit. This problem does not occur running Windows 7.