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It looks like you're accidentally sending some kind of control code to the terminal subsystem that's disabling the local echo and carriage returns.

For starters, you should be able to reset your terminal to the default state with the stty sane command (hit enter, type and pray).

Beyond that, I would inspect your program's print statements for stray escape sequences that could be causing this. If you don't find anything obvious there, you could try piping the output through something like hexdump to decode all of the console output before is passes into the pseudo-tty layer and messes things up.

Go read "Advanced Programming in the UNIX Environment" or another similar UNIX systems programming book for more details of the underlying mechanics here.