PPSSPP Runs LBP from program but not command line

[haddockd]

I might be way off but I run PPSSPP from command line exclusively. Have you tried using absolute paths versus relative pathing. Something like this in a bat file as a test to see if it works:
cd\
cd path to ppsspp (for example cd c:\emulation\PSP\PPSSPP)
ppsspp.exe "s:\path\to\roms\lbp.iso" (try keeping the .exe as well)

I may be showing my ignorance but the ppssppdl in your post above...what exactly is that?