oclHashcat-lite Input question

[Iv4n]

I'm writing a .NET GUI application that starts oclHashcat-lite as a process, reads it's standard output and tries to write to it's standard input (to control the application, get status, pause, resume, quit, etc...).

For some reason, this doesn't work. The same program, if configured to run cmd.exe and send "dir" to it's StandardInput, returns proper directory listing as the output.

Anyone knows what the reason might be behind this?