reflash again and do a full restore,to be sure you have clean system.use integrated webman.what model do you have and are you trying to launch ps3 or ps2 iso's?
edit: yes,reflash and restore will delete everything,so back everything up.
or,if you don't want to do it,you could try irisman,multiman and managunz,but i didn't test them and i don't know if they'll work.
integrated webman on v5 cobra is tested and works with ps3 iso's and ps1 bin's and .img's.dev says ps2 iso's work on nor models of ps3.