1. cron job run and working correct?
2. is there any errors in the 2 oxwall error logs?
3. is there any errors in apache error log?
4. is there any errors in php error log?
5. is there any errors in mysql error log?
6. check if you new server setup meet oxwall requirements
7. set "debug mode" in oxwall config file and load the page see if there is any errors show
8. check you have 777 permission in som folders and files for oxwall working good
9. check you have oxwall files and folders are placed in correct public html folder on your server.
10. use "developer tools" in your browser and look for errors when you load the pages.
start check this first and try look the last 0-40 errors and the date and time stamps. no need look for very very old errors in the logs