The file attachments have been re-enabled, however the new version is incompatible with existing attachments - which means that only attachments added after this point will actually work.
This does not effect images linked to from other web space, only attachments uploaded using the attachments feature. If you uploaded a previous attachment and would like it to be re-uploaded, you will need to edit your previous post and add the attachment again, or simply add it in a new post.
The attachment file size limit has now been reduced to 75k - so try to keep your images as compressed as possible. This is to help reduce server bandwidth, and also to help keep the web space usage down as low as possible.
If you have any difficulties or queries regarding file attachments, please let me know.