Move to new Domain

I had this problem before. What did fix this is upgrading or reinstalling to newer version when it releases; it needs to recache the theme and uploads section accordingly. You can remove the lock of installation, and reinstall the IPB 4 again, which did the trick for me.

I honestly miss the IPB 3 function where it had better cache management, and more customization.

EDIT: if your theme is mapped to old domain, you would have to remap those, and you are good to go.