Hey there,
I've got an old BBPress 1.x forum that's still running on PHP 5.6 and thus needs to be replaced rather sooner than later. 
Codoforum seems like a perfect (read: much better) replacement, so I started work on an importer. I took the Codoforum driver as a blue print (as well as your documentation) and finally got it to work — well, almost.
The migration process didn't show any errors:
Importing categories and users...
Categories imported in : 0.07706093788147
users imported in : 0.38718104362488
Importing topics...
topics imported in : 0.76451396942139
Importing posts...
posts imported in : 39.410881996155
Checking counts of users...
user post counts updated in : 3.2901763916016E-5 s
Checking counts of topics...
topic counts updated in : 3.3855438232422E-5 s
category counts updated in : 4.5061111450195E-5 s
Importing permissions, bans, blocks, block_roles, edits, fields, fields_roles, fields_values
Import successfull in total time 40.639749765396 s
Looking at the database, I see that all users, categories, topics and posts are there, and the values seem okay. However, when I visit the forum, it appears to be empty — there are no posts and no categories.
Looking into the admin area, it seems that nobody has permissions to view anything; and for whatever reason, I cannot change any permissions. See:
A look at the database revealed that the codo_permissions table doesn't look right. Here's what's inside:
SELECT * FROM `codo_permissions`
pid rid cid tid permission granted inherited
1 0 0 0 0 0
2 0 0 0 0 0
3 0 0 0 0 0
4 0 0 0 0 0
5 0 0 0 0 0
6 0 0 0 0 0
7 0 0 0 0 0
8 0 0 0 0 0
9 0 0 0 0 0
10 0 0 0 0 0
11 0 0 0 0 0
12 0 0 0 0 0
13 0 0 0 0 0
14 0 0 0 0 0
15 0 0 0 0 0
16 0 0 0 0 0
17 0 0 0 0 0
18 0 0 0 0 0
Before I run the migration script (with a vanilla Codoforum installation), there's much more content there.
All in all, it seems as if the permissions are somehow not set up correctly.
Does anyone have an idea what could be going on here?
I'd really appreciate any help! Thanks a lot in advance!
Cheers,
Daniel
P.S.: I'd also be happy to pay for official support, of course!