The collection comments were not too much visible so we've changed how they work. Collection comments are now using the forums, so all comments made on collections can be viewed in the Collections forums too.
The link to the collection is shown at the top of the thread. For example: Theme: Mindfuck
When creating a new collection an existing thread can be linked to the collection. For example when a collection is made after some initial discussion. Otherwise just leave the thread field empty, a new thread will be automatically created and linked to the collection upon the first comment.
Old comments were converted, when it was possible their date was kept. If a thread already existed then they were added to the end of the thread.