I merged my existing PhpBB 3.1.10 forum into a new instance of MyBB 1.8.14, now installed on a development area of my live domain. All went well. No error messages. All data converted properly. All users. All passwords. However I observed that the links used for the thread and posts had all been changed. So I read-up on this a bit, and it seems that there is an issue with links from the former phpBB site not being preserved into MyBB site. I was unable to find any solution to this problem on MyBB support forum or elsewhere. Anyone has any input?