diff --git a/LibNoDaveConnectionLibrary/DataTypes/Projectfolders/Step5/Step5BlocksFolder.cs b/LibNoDaveConnectionLibrary/DataTypes/Projectfolders/Step5/Step5BlocksFolder.cs
index b817d0fd..bd469c0e 100644
--- a/LibNoDaveConnectionLibrary/DataTypes/Projectfolders/Step5/Step5BlocksFolder.cs
+++ b/LibNoDaveConnectionLibrary/DataTypes/Projectfolders/Step5/Step5BlocksFolder.cs
@@ -36,7 +36,8 @@ public Block GetBlock(string BlockName)
 
         internal S5ProjectBlockInfo GetBlockInfo(string BlockName)
         {
-            var nm = BlockName.Replace(" ", "");
+            //Callers pass both "FB1" and "S5_FB1"; the comparison below is without the "S5_" prefix
+            var nm = BlockName.Replace(" ", "").Replace("S5_", "");
 
             lock (step5BlocksinfoList)
             {
diff --git a/LibNoDaveConnectionLibrary/PLCs/S5/MC5/MC5LIB_SYMTAB.cs b/LibNoDaveConnectionLibrary/PLCs/S5/MC5/MC5LIB_SYMTAB.cs
index be6cc9d5..7a5f5643 100644
--- a/LibNoDaveConnectionLibrary/PLCs/S5/MC5/MC5LIB_SYMTAB.cs
+++ b/LibNoDaveConnectionLibrary/PLCs/S5/MC5/MC5LIB_SYMTAB.cs
@@ -132,7 +132,7 @@ static class MC5LIB_SYMTAB
                                      new object[] {0x5B80, 0x0000, 9, 7, 0xff80, 0x007f, "T", "AD", "PrintNummer",ReferenceDataAccessMode.Write},
                                      new object[] {0x5C00, 0x0000, 8, 8, 0xff00, 0x00ff, "S", "Z", "PrintNummer",ReferenceDataAccessMode.Write},
                                      new object[] {0x5D00, 0x0000, 8, 8, 0xff00, 0x00ff, "SPB", "SB", "PrintNummer",ReferenceDataAccessMode.Call},
-                                     new object[] {0x5F00, 0x0000, 8, 6, 0xff00, 0x00ff, "L", "QB", "PrintNummer",ReferenceDataAccessMode.Read},
+                                     new object[] {0x5F00, 0x0000, 8, 8, 0xff00, 0x00ff, "L", "QB", "PrintNummer",ReferenceDataAccessMode.Read},
                                      new object[] {0x6000, 0x0000, 16, 0, 0xffff, 0x0000, ":F", null, null,ReferenceDataAccessMode.None},
                                      new object[] {0x6003, 0x0000, 16, 0, 0xffff, 0x0000, ":G", null, null,ReferenceDataAccessMode.None},
                                      new object[] {0x6004, 0x0000, 16, 0, 0xffff, 0x0000, "xF", null, null,ReferenceDataAccessMode.None},
diff --git a/LibNoDaveConnectionLibrary/PLCs/S5/MC5/MC5toDB.cs b/LibNoDaveConnectionLibrary/PLCs/S5/MC5/MC5toDB.cs
index 2ee51c4c..ea0c3a54 100644
--- a/LibNoDaveConnectionLibrary/PLCs/S5/MC5/MC5toDB.cs
+++ b/LibNoDaveConnectionLibrary/PLCs/S5/MC5/MC5toDB.cs
@@ -88,6 +88,8 @@ public static S5DataBlock GetDB(ProjectPlcBlockInfo blkInfo, byte[] block, byte[
                     {
                         s7DataRow = new S7DataRow(string.Empty, S7DataRowType.S5_KH, retVal);
                         main.Add(s7DataRow);
+                        //Rows not described by a pre-header are still referenced by line number in the comment block
+                        zeilenListe.Add(s7DataRow);
                     }
 
                     switch (s7DataRow.DataType)
diff --git a/LibNoDaveConnectionLibrary/Projectfiles/Step5Project.cs b/LibNoDaveConnectionLibrary/Projectfiles/Step5Project.cs
index 4b9d8724..90b7df61 100644
--- a/LibNoDaveConnectionLibrary/Projectfiles/Step5Project.cs
+++ b/LibNoDaveConnectionLibrary/Projectfiles/Step5Project.cs
@@ -176,8 +176,16 @@ protected override void LoadProject()
                         int len = 0;
 
                         ByteAddressOFExistingBlocks.Add(n);
+                        int blockStart = n;
                         var tmp = AddBlockInfo(s5ProjectByteArray, ref n, blkFld,
                                                bstHeaders[akanz - 1]);
+
+                        //Comment blocks (PK, FK, DK, ...) can carry the type byte of their parent block (PB, FB, DB, ...),
+                        //so they would be read as a second PB, FB, DB. The type of the section they are stored in is the real one.
+                        int blockTypeByte = s5ProjectByteArray[blockStart] == 0x70 ? s5ProjectByteArray[blockStart + 2] : s5ProjectByteArray[blockStart];
+                        if (tmp != null && blockTypeByte != section_header_type)
+                            tmp.BlockType = (PLCBlockType)(section_header_type | 0xf00);
+
                         if (tmp != null)
                             blkFld.step5BlocksinfoList.Add(tmp);