Quote Originally Posted by Max Dread View Post
So is there anything else left to try or look into, or will this have to be put down to "one of those things"?
I suggest you concentrate on the likelihood that there is a problem with your files and/or system and NOT with the software, as there are many users using the Replay Gain utility codec R5 without any problems.

Without access to your system, it is difficult to diagnose the problem.

FYI, of the 5 files you have posted I can run Test Conversion and Replay Gain successfully on all of them except
Wolf Eyes - Slicer - 02 - Untitled 02.mp3

which gives the same error for both Test Conversion and Replay Gain utility codec R5:
Error converting to [ReplayGain], 'C:\Test\Wolf Eyes - Slicer - 02 - Untitled 02.mp3' to 'C:\Test\Wolf Eyes - Slicer - 02 - Untitled 02.IGNORE'
Error decoding mp3 data stream, is corrupt?