I've updated my toolchain with the latest GCC patches (perhaps not a good idea :-) and the latest PSPSDK and now Lua Player compiled with it doesn't run any more. I tracked down the problem to the USB support and the storage example doesn't work, too. When compiling with "make EBOOT.PBP" and starting it from PSP, screen is black, home button doesn't work and USB doesn't work, but it doesn't crash and shutdown, just freeze.
Ahem, well in the import upgrade the stubs for USB didn't have their late binding flags set so the psp wont be able to load the elf. Hopefully fixed now :)