It appears from using the UBB Forum at twoplustwo.com that the "Print Topic" feature fails to return any content if the topic (or any reply to the topic) includes a poll.

In UBB 7, Print Topic returns the post content, but not the poll subject or poll choices.

not sure about 6.5.5 - but if you think there is a bug in 7.x, best bet is to make a second post in the 7.x bug forum

i'm sure this has been posted under v7x too.