diff --git a/BizHawk.Client.Common/7z/ArchiveUpdateCallback.cs b/BizHawk.Client.Common/7z/ArchiveUpdateCallback.cs
index a9f838e70b..ea26b87a5c 100644
--- a/BizHawk.Client.Common/7z/ArchiveUpdateCallback.cs
+++ b/BizHawk.Client.Common/7z/ArchiveUpdateCallback.cs
@@ -263,13 +263,14 @@ namespace SevenZip
             _entries = new string[streamDict.Count];
             streamDict.Keys.CopyTo(_entries, 0);
             _actualFilesCount = streamDict.Count;
-            foreach (Stream str in _streams)
-            {
-                if (str != null)
-                {
-                    _bytesCount += str.Length;
-                }
-            }
+					//zero 11-oct-2014 - we want sequential streams only. length is unknown.
+						//foreach (Stream str in _streams)
+						//{
+						//    if (str != null)
+						//    {
+						//        _bytesCount += str.Length;
+						//    }
+						//}
             CommonInit(compressor, updateData, directoryStructure);
         }
 
@@ -780,25 +781,27 @@ namespace SevenZip
 
         private void IntEventArgsHandler(object sender, IntEventArgs e)
         {
-            lock (_files)
-            {
-                var pold = (byte) ((_bytesWrittenOld*100)/_bytesCount);
-                _bytesWritten += e.Value;
-                byte pnow;
-                if (_bytesCount < _bytesWritten) //Holy shit, this check for ZIP is golden
-                {
-                    pnow = 100;
-                }
-                else
-                {
-                    pnow = (byte)((_bytesWritten * 100) / _bytesCount);
-                }
-                if (pnow > pold)
-                {
-                    _bytesWrittenOld = _bytesWritten;
-                    OnCompressing(new ProgressEventArgs(pnow, (byte) (pnow - pold)));
-                }
-            }
+					//zero 11-oct-2014 - first of all, its possible for _files to be null (if we're compressing streams)
+					//second of all, if we're compressing streams, we cant possibly have _bytesCount anyway. so.. goodbye
+						//lock (_files)
+						//{
+						//    var pold = (byte) ((_bytesWrittenOld*100)/_bytesCount);
+						//    _bytesWritten += e.Value;
+						//    byte pnow;
+						//    if (_bytesCount < _bytesWritten) //Holy shit, this check for ZIP is golden
+						//    {
+						//        pnow = 100;
+						//    }
+						//    else
+						//    {
+						//        pnow = (byte)((_bytesWritten * 100) / _bytesCount);
+						//    }
+						//    if (pnow > pold)
+						//    {
+						//        _bytesWrittenOld = _bytesWritten;
+						//        OnCompressing(new ProgressEventArgs(pnow, (byte) (pnow - pold)));
+						//    }
+						//}
         }
     }
 #endif
diff --git a/BizHawk.Client.Common/7z/SevenZipCompressor.cs b/BizHawk.Client.Common/7z/SevenZipCompressor.cs
index fcb2ea7307..a0c4661027 100644
--- a/BizHawk.Client.Common/7z/SevenZipCompressor.cs
+++ b/BizHawk.Client.Common/7z/SevenZipCompressor.cs
@@ -1685,7 +1685,9 @@ Enum.GetName(typeof(ZipEncryptionMethod), ZipEncryptionMethod))
 #else
             foreach (var pair in streamDictionary)
             {
-                if (pair.Value != null && (!pair.Value.CanSeek || !pair.Value.CanRead))
+                if (pair.Value != null && (
+									//!pair.Value.CanSeek ||  //zero 11-oct-2014 - this is dumb, and I made it no longer necessary
+									!pair.Value.CanRead))
                 {
                     if (!ThrowException(null, new ArgumentException(
                             "The specified stream dictionary contains an invalid stream corresponding to the archive entry \"" + pair.Key + "\".",