V21 is leaking hidden cmd windows.
I don't know what does it, but I've got three on my system right now.
Started 7/18/2016
ntpinit.exe ntpinit.exe 0.01 3,176 K 5,264 K 8672 "C:\Program Files\SlickEdit Pro 21.0.0 Beta1\win\ntpinit.exe" \\.\Pipe\slick\6384.0 \\.\Pipe\slick\6384.1 C:\Windows\system32\cmd.exe
Started 7/20 10:09am
ntpinit.exentpinit.exe0.013,160 K5,280 K8912"C:\Program Files\SlickEdit Pro 21.0.0 Beta1\win\ntpinit.exe" \\.\Pipe\slick\6316.0 \\.\Pipe\slick\6316.1 C:\Windows\system32\cmd.exe
Started 7/20 3:37 pm
ntpinit.exe ntpinit.exe 0.01 3,172 K 5,576 K 560 "C:\Program Files\SlickEdit Pro 21.0.0 Beta1\win\ntpinit.exe" \\.\Pipe\slick\8124.0 \\.\Pipe\slick\8124.1 C:\Windows\system32\cmd.exe