The current (2.0.1) version of the vBulletin 4 with vBulletin Blog importer will import Blog attachments from blogs created prior to installation of vBulletin 4, but will not yet import attachments that were created after the vBulletin 4 update. This will be resolved in the next release.
If you have a vBulletin 4 installation without the vBulletin Blog add-on, or if you are not interested in importing blog attachments, this issue will not affect you.
The vBulletin 3, vBulletin 3 with Blogs and vBulletin 5 importers currently have no known issues.
If you have a vBulletin 4 installation without the vBulletin Blog add-on, or if you are not interested in importing blog attachments, this issue will not affect you.
The vBulletin 3, vBulletin 3 with Blogs and vBulletin 5 importers currently have no known issues.