diff --git a/CMakeLists.txt b/CMakeLists.txt
index bb520ff50..942838010 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,7 +25,7 @@ set(DF_VERSION_MINOR "31")
 set(DF_VERSION_PATCH "25")
 set(DF_VERSION "${DF_VERSION_MAJOR}.${DF_VERSION_MINOR}.${DF_VERSION_PATCH}")
 
-set(DFHACK_RELEASE "7")
+set(DFHACK_RELEASE "7b")
 
 ## where to install things (after the build is done, classic 'make install' or package structure)
 # the dfhack libraries will be installed here:
diff --git a/library/Core.cpp b/library/Core.cpp
index b52ddc6c1..62f556e01 100644
--- a/library/Core.cpp
+++ b/library/Core.cpp
@@ -410,18 +410,9 @@ bool Core::Init()
     p = new DFHack::Process(vif);
     vinfo = p->getDescriptor();
 
-    if(!vinfo)
+    if(!vinfo || !p->isIdentified())
     {
-        cerr << "Couldn't retrieve version information.\n";
-        errorstate = true;
-        delete p;
-        p = NULL;
-        return false;
-    }
-
-    if (!p->isIdentified())
-    {
-        cerr << "Couldn't identify this version of DF.\n";
+        cerr << "Not a known DF version. DFHack will now deactivate.\n";
         errorstate = true;
         delete p;
         p = NULL;
diff --git a/library/Process-linux.cpp b/library/Process-linux.cpp
index 718d0f804..59adeeeb8 100644
--- a/library/Process-linux.cpp
+++ b/library/Process-linux.cpp
@@ -48,47 +48,39 @@ Process::Process(VersionInfoFactory * known_versions)
     const char * exe_link_name = "/proc/self/exe";
     const char * cwd_name = "/proc/self/cwd";
     const char * cmdline_name = "/proc/self/cmdline";
-    char target_name[1024];
     int target_result;
 
     identified = false;
     my_descriptor = 0;
 
-    // resolve /proc/self/exe link
-    target_result = readlink(exe_link_name, target_name, sizeof(target_name)-1);
-    if (target_result == -1)
+    md5wrapper md5;
+    // get hash of the running DF process
+    string hash = md5.getHashFromFile(exe_link_name);
+    // create linux process, add it to the vector
+    VersionInfo * vinfo = known_versions->getVersionInfoByMD5(hash);
+    if(vinfo)
     {
-        cerr << "Failed to readlink(/proc/self/exe)\n";
-        return;
-    }
-    // make sure we have a null terminated string...
-    target_name[target_result] = 0;
-
-    // is this the regular linux DF?
-    if (strstr(target_name, "dwarfort.exe") != 0 || strstr(target_name,"Dwarf_Fortress") != 0)
-    {
-        md5wrapper md5;
-        // get hash of the running DF process
-        string hash = md5.getHashFromFile(target_name);
-        // create linux process, add it to the vector
-        VersionInfo * vinfo = known_versions->getVersionInfoByMD5(hash);
-        if(vinfo)
-        {
-            my_descriptor = new VersionInfo(*vinfo);
-            my_descriptor->setParentProcess(this);
-            identified = true;
-        }
-        else
-        {
-            cerr << "Unable to retrieve version information.\n";
-        }
+        my_descriptor = new VersionInfo(*vinfo);
+        my_descriptor->setParentProcess(this);
+        identified = true;
     }
     else
     {
-        cerr << "This isn't DF.\n";
+        char * wd = getcwd(NULL, 0);
+        cerr << "Unable to retrieve version information.\n";
+        cerr << "File: " << exe_link_name << endl;
+        cerr << "MD5: " << hash << endl;
+        cerr << "working dir: " << wd << endl;
+        free(wd);
     }
 }
 
+Process::~Process()
+{
+    // destroy our copy of the memory descriptor
+    delete my_descriptor;
+}
+
 string Process::doReadClassName (void * vptr)
 {
     //FIXME: BAD!!!!!
diff --git a/library/depends/md5/md5wrapper.cpp b/library/depends/md5/md5wrapper.cpp
index 241d2bb31..4af7b12d4 100644
--- a/library/depends/md5/md5wrapper.cpp
+++ b/library/depends/md5/md5wrapper.cpp
@@ -24,7 +24,8 @@
 //basic includes
 #include <fstream>
 #include <iostream>
-
+#include <errno.h>
+#include <string.h>
 //my includes
 #include "md5wrapper.h"
 #include "md5.h"
@@ -118,15 +119,32 @@ std::string md5wrapper::getHashFromFile(std::string filename)
     //open file
     if ((file = fopen (filename.c_str(), "rb")) == NULL)
     {
-        return "-1";
+        return "file unreadable.";
     }
 
     //init md5
     md5->MD5Init (&context);
 
     //read the filecontent
-    while ( (len = fread (buffer, 1, 1024, file)) )
+    while (1)
     {
+        errno = 0;
+        len = fread (buffer, 1, 1024, file);
+        if(len != 1024)
+        {
+            int err = ferror(file);
+            //FIXME: check errno here.
+            if(err)
+            {
+                fclose(file);
+                return strerror(err);
+            }
+            if(feof(file))
+            {
+                md5->MD5Update (&context, buffer, len);
+                break;
+            }
+        }
         md5->MD5Update (&context, buffer, len);
     }
 
diff --git a/plugins/cleaners.cpp b/plugins/cleaners.cpp
index 209ce79b1..94de962ad 100644
--- a/plugins/cleaners.cpp
+++ b/plugins/cleaners.cpp
@@ -78,10 +78,14 @@ command_result cleanmap (Core * c, bool snow, bool mud)
                     {
                         DFHack::t_spattervein * vein = splatter[i];
                         // filter snow
-                        if(!snow && vein->mat1 == water_idx && vein->matter_state == DFHack::state_powder)
+                        if(!snow
+                            && vein->mat1 == DFHack::Materials::WATER
+                            && vein->matter_state == DFHack::state_powder)
                             continue;
                         // filter mud
-                        if(!mud && vein->mat1 == mud_idx && vein->matter_state == DFHack::state_solid)
+                        if(!mud
+                            && vein->mat1 == DFHack::Materials::MUD
+                            && vein->matter_state == DFHack::state_solid)
                             continue;
                         Mapz->RemoveBlockEvent(x,y,z,(t_virtual *) vein);
                         cleaned = true;