UBB.threads PHP Forum Software Community Forums UBB.threads 7 Importer Support Forums not importing

The categories and forums should be done right after the users are imported. It could be that the forums were imported but not assigned to a category, especially if your classic site only has a single category.

What you can try, is this. Run the following SQL command;

update ubbt_FORUMS set CATEGORY_ID='1'

then Clear the Cache, and see if the forums show up.