I had a problem adding words to custom lists a while back; the problem went away and has now returned.
1. Add the phrase 阿狗阿猫|Any Tom, Dick or Harry
2. Click "Validate Words"
3. Get the box prompting for Pinyin (why, I'm not sure; all those characters are already in the system)
4. Fill in the Pinyin a1 gou3 a1 mao1
5. Click "Add" (I forget the name of the button)
At this point I see "Submitting", and it never finishes.
James