They also don't work in YAFL. It seems to be a problem with the fenix runtime not correctly handling the app path that is passed to it. I've taken a quick look at the runtime code and it looks like it should work, but the way the particular bit of code is written often seems to cause random problems on the gp32. I would find the very latest runtime code and quickly try different implementations of the problem code to try and create a fix, but fenix uses SDL and I need to get the libraries configured first. I might give it a go tomorrow if I find time (people are producing a lot of cool stuff with fenix these days, and it would be a shame if people have to use something other than their prefered launcher to run them).