Dreamcast crashes after exiting split screen mode, then going in-game again

[UnknownShadow200]

When debugging under lxdream-nitro either:

• It crashes with invalid address when freeing memory
• It crashes with invalid address when allocating memory
• The emulated console reboots

So probably a buffer overrun or double free somewhere. Might affect other consoles too.

[UnknownShadow200]

Affects the PS2 port too, so it's definitely a common issue