I've tested gb, gbc, gba, snes, nes, megadrive and psx. The problem was the same with all.
But, i've just installed the 1.5.2 ipk & it works just fine again...
I noticed the upgrading of pymeny doesn't work if pymenu is installed. I have to uninstall it first, then it works.
I haven't run neogeo with success yet with pymenu (working with gmenu2x), don't know why...
Thanx again !