Cannot respond some discussion here

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Dear friends, I found I couldn't respond some discussions on mylot since last Saturday! I don't know why. After reading these discussions, I pressed "post response", then the web pages were same as usual, I mean, no textbox for inputting. I tried several times, but getting the same result. And these discussions are usually new and no respond. And several words in post are in blue and with a underline (you can press these words directly, then web page with automatic link will be opened by itself). I just wonder if you encountered the same situation as me. What's the reason? Could you give me some suggestions on it?