I have a big problem with pset2. I got 0.5 although both programs (vigenere and ceasar) work fine when I test them on my own, without check50. I got 100% for vigenere, and 0% for ceasar. Do you know what could have happened? I used update50. Every time I type correct ID for ceasar, after several seconds, "Invalid ID" appears. Help me, please.