C# – Loading Album art with TagLib sharp and then saving it to same/different file in C# causes memory error

My application lists all MP3's in a directory and when the user selects a file it loads the tag info, including album art. The art is loaded into a variable to be used when the user saves the data. The art is also loaded into a picture frame for the user to see.

// Global to all methods
System.Drawing.Image currentImage = null;

// In method onclick of the listbox showing all mp3's
TagLib.File f = new TagLib.Mpeg.AudioFile(file);
if (f.Tag.Pictures.Length > 0)
{
      TagLib.IPicture pic = f.Tag.Pictures[0];
      MemoryStream ms = new MemoryStream(pic.Data.Data);
      if (ms != null && ms.Length > 4096)
      {
           currentImage = System.Drawing.Image.FromStream(ms);
           // Load thumbnail into PictureBox
           AlbumArt.Image = currentImage.GetThumbnailImage(100,100, null, System.IntPtr.Zero);
      }
      ms.Close();
}

// Method to save album art
TagLib.Picture pic = new TagLib.Picture();
pic.Type = TagLib.PictureType.FrontCover;
pic.MimeType = System.Net.Mime.MediaTypeNames.Image.Jpeg;
pic.Description = "Cover";
MemoryStream ms = new MemoryStream();
currentImage.Save(ms, ImageFormat.Jpeg); // <-- Error occurs on this line
ms.Position = 0;
pic.Data = TagLib.ByteVector.FromStream(ms);
f.Tag.Pictures = new TagLib.IPicture[1] { pic };
f.save();
ms.Close();

If I load the image and try to save it right away I get this "Attempted to read or write protected memory. This is often an indication that other memory is corrupt." If I try to save currentImage as a ImageFormat.Bmp I get this "A generic error occurred in GDI+."

My save method works correctly if I load an image from a url like this:

WebRequest req = WebRequest.Create(urlToImg);
WebResponse response = req.GetResponse();
Stream stream = response.GetResponseStream();
currentImage = Image.FromStream(stream);
stream.Close();

So I'm guessing there is an issue with the way that I am loading the image into currentImage when the user selects an MP3 from the listbox.

I have found a lot of examples of loading and saving images to mp3's but no one seems to be having this issue when they try to save the are immediately after loading it.