Seems to be an issue with erk dumper. Which firmware are you ? This issue also exist in idpset, I never managed to fix it yet, it seems to be 'randomly' freezing when you launch the payload....
Maybe when it froze the 1st time it generated a corrupted erk. (To get the br disc key we need the erk.)
Is it working on the nightly version ? https://github.com/Zarh/ManaGunZ/releases/tag/nightly
Can you enable DEBUG to see every message ?
I think i fixed this issue in 1.41.I'll try to fix the other freeze you have in 1.41.
it may seems counterintuitive but the encrypted iso aren't decrypted by the PS3 when it's mounted by cobra/mamba. The decryption part isn't supported by rawsceiso (the plugin which handle ISO mounting). So, it's normal for the PS3 to NOT be able to read the EBOOT and to return the 80010017. AFAIK there is only ps3netserv who support mounting with encrypted ISO, it does't the decryption before sending information to the ps3. Redump.org collect information on encrypted iso as it's the raw data of the BR disc.
The error on the "Copy option" isn't normal... can you check the integrity of files ? (with IRD)
After even more testing, it seems the bug is actually caused by ManaGunZ' first launch, as apposed to formatting the PS3. I'm able to reproduce the freeze every single time by deleting eid_root_key, 3Dump.bin, and also deleting then reinstalling ManaGunZ.