PS3: error while moving game to new location

This post is only for people using a PS3 and encountering the mentioned error when using Multiman or Rogero.

I use Multiman and Rogero as game managers on my jailbroken PS3. Yesterday when launching a game with Multiman it threw "error occurred while moving game to new location" at me with every game.

I also tried Rogero 8.2 and that gave me "error occurred while mounting the games folder"...

I Googled a while and tried a couple of things. My external USB contained a PS3_GAME folder in the root. I think that was left when Multiman emulated it as a blu-ray? Anyway: after deleting it, the error went away and i was able to launch games again (found that solution here).

Before that i also connected the external USB HD to a Windows PC and checked the games folders: i read somewhere those folders shouldn't be Read Only (i have no idea why they somehow would be flagged Read Only but checked it anyway).