This happens if the CXMB plugin is outdated or corrupt. Restart the PSP while holding the to enter the Recovery Menu, disable cxmb.prx , reboot, and update the plugin file.
At the heart of the CTF ecosystem is a crucial homebrew plugin known as CXMB (Custom XMB). The PSP operating system loads its interface from internal flash memory (specifically flash0 ). Directly modifying these internal files carried a massive risk of "bricking" or permanently breaking the handheld console. Psp Ctf Theme Pack 6.60
When downloading a comprehensive theme pack, you will generally find themes sorted into several distinct visual styles: This happens if the CXMB plugin is outdated or corrupt