According to the import script, everything was successfully imported from ubbthreads 6.5.1 to 7.4.1 install.

But I've been seeing numerous issues.

- All regular members seem to be long to "Administrators" group now...how can this happen??

Now it shows my site having thousands of Administrators as oppose to 1.

Other issues are having no Reply button on posts. Some topic not displaying at all with this error:

There was a problem looking up this post in our database.

Any ideas on how I can resolve specially the first issue would be great.

Thanks!!

I replied to your cross post on the admin issue already.
The reply issue is usually a permission setting.
In your case you can check it at
Control Panel » Group Management select the forum link for each group one at a time.
Check the "Can reply to existing topics " setting. It should be the right column second one down.
They should be set to 1 in each desired forum to enable the group to reply.

As far as the database issue just like your user groups set incorrectly, I suggest opening a support ticket so Rick can take a peek.

We've taken care of this via a support ticket. Looks like there was some data issues in several areas that need to be addressed manually.