Here you will find some of the issues that are common when working with mods on Classic REbirth.

RDT file crashes the game as soon as text is supposed to appear on screen

If you're using a tool that works only on Platinum Edition RDT files, it's likely to be incorrectly indexing text data, leaving the English text pointer as an invalid value (you can check this scenario by enabling Japanese, if that works you're missing data).

Solution 1

In order to quickly fix this issue, open the RDT file in a hex editor and jump at address 0x3C, then copy the four bytes there to address 0x40. This will make sure that text data is indexed at the correct address of the file.

Solution 2

For a more elegant and universal solution, create XML data for room text and it will override automatically the RDT contents.