I see the same thing as shown in DELee's screenshots.
this seems similar to issue #2 I reported in my post in the "Errors editing wiki" thread:
Error Message when updating Wiki
except in this case it's in the middle of a CODE block instead of a LIST. It seems that whoever wrote the new wiki functionality failed to account for the possibility that the "..." cutoff for the "Show more" might appear in the middle of an open bbcode tag.