All users show up as "guest" after import.
 

I did the import and it seems to have gone well. However, when I look at any thread in any forum, the title under every member's name is "guest". I did delete the imported "User" group which seems to have moved all the users to the "Registered Member" group. But none are showing up correctly.

I hope this is the right place to post this.

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Update: The member list has the correct member titles, and any NEW thread/post has the correct title. It seems that any imported post of thread just says "guest" under the poster's name. I did run all the maintenance scripts but it still seems to have the problem. Really hope someone can help with this one.