[Kacela]

The /arcade/tmp directory is where the Arcade installer temporarily extracts the contents of uploaded .tar or .zip games into the individual files. Then are copied to their appropriate destinations. If something interrupts the normal extraction of these files, or the .php that accompanys each game is coded badly, the install will fail, and the temporarily extracted files get left behind as residue :P

So, (I say in a much less condescending tone than Zachery) anything that remains in the /arcade/tmp directory is probably just garbage left over from a failed install, and not a bug in the Arcade coding itself.

If it constantly happens after every install, you might want to double check the permissions of that tmp directory, just to make sure that the arcade installer has the rights to remove any tmp files after a succesfull install.