diff --git a/spec/mspec/lib/mspec/runner/exception.rb b/spec/mspec/lib/mspec/runner/exception.rb
index aea6610cd3..e07f02f684 100644
--- a/spec/mspec/lib/mspec/runner/exception.rb
+++ b/spec/mspec/lib/mspec/runner/exception.rb
@@ -40,6 +40,15 @@ class ExceptionState
     @backtrace_filter ||= MSpecScript.config[:backtrace_filter] || %r{(?:/bin/mspec|/lib/mspec/)}
 
     bt = @exception.backtrace || []
-    bt.select { |line| $MSPEC_DEBUG or @backtrace_filter !~ line }.join("\n")
+    unless $MSPEC_DEBUG
+      # Exclude <internal: entries inside MSpec code, so only after the first ignored entry
+      first_excluded_line = bt.index { |line| @backtrace_filter =~ line }
+      if first_excluded_line
+        bt = bt[0...first_excluded_line] + bt[first_excluded_line..-1].reject { |line|
+          @backtrace_filter =~ line || /^<internal:/ =~ line
+        }
+      end
+    end
+    bt.join("\n")
   end
 end
diff --git a/spec/mspec/lib/mspec/runner/mspec.rb b/spec/mspec/lib/mspec/runner/mspec.rb
index 0e2496d3d7..8331086196 100644
--- a/spec/mspec/lib/mspec/runner/mspec.rb
+++ b/spec/mspec/lib/mspec/runner/mspec.rb
@@ -155,7 +155,9 @@ module MSpec
 
   # Stores the shared ContextState keyed by description.
   def self.register_shared(state)
-    @shared[state.to_s] = state
+    name = state.to_s
+    raise "duplicated shared #describe: #{name}" if @shared.key?(name)
+    @shared[name] = state
   end
 
   # Returns the shared ContextState matching description.
diff --git a/spec/mspec/lib/mspec/utils/version.rb b/spec/mspec/lib/mspec/utils/version.rb
index 787a76b053..9c1c58b8df 100644
--- a/spec/mspec/lib/mspec/utils/version.rb
+++ b/spec/mspec/lib/mspec/utils/version.rb
@@ -42,7 +42,7 @@ class SpecVersion
 
   def <=>(other)
     if other.respond_to? :to_int
-      other = Integer other
+      other = Integer(other.to_int)
     else
       other = SpecVersion.new(String(other)).to_i
     end
diff --git a/spec/mspec/spec/fixtures/config.mspec b/spec/mspec/spec/fixtures/config.mspec
index 4a069e2eb0..01654c5094 100644
--- a/spec/mspec/spec/fixtures/config.mspec
+++ b/spec/mspec/spec/fixtures/config.mspec
@@ -1,8 +1,6 @@
 class MSpecScript
   set :target, 'ruby'
 
-  set :backtrace_filter, /lib\/mspec\//
-
   set :tags_patterns, [
                         [%r(spec/fixtures/), 'spec/fixtures/tags/'],
                         [/_spec.rb$/, '_tags.txt']
diff --git a/spec/mspec/spec/integration/run_spec.rb b/spec/mspec/spec/integration/run_spec.rb
index df10f77094..99a5416cb0 100644
--- a/spec/mspec/spec/integration/run_spec.rb
+++ b/spec/mspec/spec/integration/run_spec.rb
@@ -9,14 +9,12 @@ Expected 1 == 2
 to be truthy but was false
 CWD/spec/fixtures/a_spec.rb:8:in `block (2 levels) in <top (required)>'
 CWD/spec/fixtures/a_spec.rb:2:in `<top (required)>'
-CWD/bin/mspec-run:7:in `<main>'
 
 2)
 Foo#bar fails ERROR
 RuntimeError: failure
 CWD/spec/fixtures/a_spec.rb:12:in `block (2 levels) in <top (required)>'
 CWD/spec/fixtures/a_spec.rb:2:in `<top (required)>'
-CWD/bin/mspec-run:7:in `<main>'
 
 Finished in D.DDDDDD seconds
 EOS
diff --git a/spec/mspec/spec/integration/tag_spec.rb b/spec/mspec/spec/integration/tag_spec.rb
index 1882d71e32..f4df2f0dc4 100644
--- a/spec/mspec/spec/integration/tag_spec.rb
+++ b/spec/mspec/spec/integration/tag_spec.rb
@@ -28,7 +28,6 @@ Expected 1 == 2
 to be truthy but was false
 CWD/spec/fixtures/tagging_spec.rb:9:in `block (2 levels) in <top (required)>'
 CWD/spec/fixtures/tagging_spec.rb:3:in `<top (required)>'
-CWD/bin/mspec-tag:7:in `<main>'
 
 2)
 Tag#me érròrs in unicode FAILED
@@ -36,7 +35,6 @@ Expected 1 == 2
 to be truthy but was false
 CWD/spec/fixtures/tagging_spec.rb:13:in `block (2 levels) in <top (required)>'
 CWD/spec/fixtures/tagging_spec.rb:3:in `<top (required)>'
-CWD/bin/mspec-tag:7:in `<main>'
 
 Finished in D.DDDDDD seconds