I'm on 3.90 M33 with 1.5k and I have the popsloader thing with all of the available .prxs in SEPlugins.
I don't have any trouble loading single disc PS1 games, everything works fine and dandy.
However, when I try and load a PSX game with more than one disc, it won't work. On Metal Gear Solid, it goes to the first screen after the playstation logo - something about Kojima I think, then the screen goes black as if it were getting ready to display another screen but it never does, it just hangs there forever. I can press the home button and quit the game, I can even reset it.
Same thing happens with Chrono Cross - it gets to the first Square screen then stops loading new stuff. I can never get to the menus or anything.
For space reasons, I've only been trying with the first disc eboot on the card. I don't have both discs on it at the same time.
What program are you using to covert the game to eboot? I was having a big problem with FF VII but after downgrading my firmware to 3.71 and turning popsloader off the game runs fine.
I think I've found the problem, but I'll have to wait until my new memory stick gets here to find out for sure. Plugins don't work with the Lexar sticks. My stick is a Lexar 2GB, so Popsloader doesn't work.