I am going through x10exchange today, I am going to try to get everything sorted out. I wasn't aware of any code problems, can you provide a description, and how to get the errors?
I already posted about this in the Want 500 Credits thread, and I made a thread last night on the x10Exchange forums about it. Russ is looking into fixing it, I already posted the valid code here:
Read the first post in the above thread if you want the code that validates as XHTML 1.1 Transitional, it won't validate as strict because of the use of the <iframe> tag.