diff --git a/lib/metasm/metasm/decode.rb b/lib/metasm/metasm/decode.rb
index 303f905b82..564ead2915 100644
--- a/lib/metasm/metasm/decode.rb
+++ b/lib/metasm/metasm/decode.rb
@@ -13,8 +13,10 @@ module Metasm
 class DecodedInstruction
 	# the instance of InstructionBlock this di is into
 	attr_accessor :block
-	# our offset (in bytes) from the start of the block
+	# our offset (in bytes) from the start of the block, used only for hexdump
 	attr_accessor :block_offset
+	# the address of the instruction's first byte in memory
+	attr_accessor :address
 	# the disassembled data
 	attr_accessor :instruction, :opcode
 	# our, length in bytes
@@ -29,14 +31,14 @@ class DecodedInstruction
 		@bin_length = 0
 	end
 
-	def address
-		@block.address + @block_offset
-	end
-
 	def next_addr
 		address + @bin_length
 	end
 
+	def block_head?
+		self == @block.list.first
+	end
+
 	def show
 		if block
 			bin = @block.edata.data[@block.edata_ptr+@block_offset, @bin_length].unpack('C*').map { |c| '%02x' % c }.join
@@ -151,6 +153,10 @@ class InstructionBlock
 		@backtracked_for = []
 	end
 
+	def bin_length
+		(di = @list.last) ? di.block_offset + di.bin_length : 0
+	end
+	
 	# splits the current block into a new one with all di from address addr to end
 	# caller is responsible for rebacktracing new.bt_for to regenerate correct old.btt/new.btt
 	def split(addr)
@@ -174,7 +180,8 @@ class InstructionBlock
 	# adds a decodedinstruction to the block list, updates di.block and di.block_offset
 	def add_di(di)
 		di.block = self
-		di.block_offset = (@list.empty? ? 0 : (@list.last.block_offset + @list.last.bin_length))
+		di.block_offset = bin_length
+		di.address ||= @address + di.block_offset
 		@list << di
 	end
 
@@ -855,7 +862,7 @@ puts "  finalize subfunc #{Expression[subfunc]}" if debug_backtrace
 
 		if di = @decoded[addr]
 			if di.kind_of? DecodedInstruction
-				split_block(di.block, di.address) if di.block_offset != 0	# this updates di.block
+				split_block(di.block, di.address) if not di.block_head?	# this updates di.block
 				di.block.add_from(from, from_subfuncret ? :subfuncret : :normal) if from and from != :default
 				bf = di.block
 			end
@@ -1741,7 +1748,7 @@ puts "   backtrace_indirection for #{ind.target} failed: #{ev}" if debug_backtra
 	def dump(dump_data=true, &b)
 		b ||= proc { |l| puts l }
 		@sections.sort.each { |addr, edata|
-			blockoffs = @decoded.values.map { |di| Expression[di.block.address, :-, addr].reduce if di.kind_of? DecodedInstruction and di.block_offset == 0 }.grep(::Integer).sort.reject { |o| o < 0 or o >= edata.length }
+			blockoffs = @decoded.values.map { |di| Expression[di.block.address, :-, addr].reduce if di.kind_of? DecodedInstruction and di.block_head? }.grep(::Integer).sort.reject { |o| o < 0 or o >= edata.length }
 			b[@program.dump_section_header(addr, edata)]
 			if not dump_data and edata.length > 16*1024 and blockoffs.empty?
 				b["// [#{edata.length} data bytes]"]
@@ -1750,15 +1757,14 @@ puts "   backtrace_indirection for #{ind.target} failed: #{ev}" if debug_backtra
 			unk_off = 0
 			# blocks.sort_by { |b| b.addr }.each { |b|
 			edata.length.times { |i|
-				if di = @decoded[addr+i] and di.kind_of? DecodedInstruction and di.block_offset == 0
+				if di = @decoded[addr+i] and di.kind_of? DecodedInstruction and di.block_head?
 					if unk_off != di.block.edata_ptr
 						b["\n// ------ overlap (#{unk_off-di.block.edata_ptr}) ------"]
 					elsif di.block.from_normal.kind_of? ::Array
 						b["\n"]
 					end
 					dump_block(di.block, &b)
-					di = di.block.list.last
-					unk_off = i + di.block_offset + di.bin_length
+					unk_off = i + di.block.bin_length
 				elsif i >= unk_off
 					next_off = blockoffs.find { |bo| bo > i } || edata.length
 					if dump_data or next_off - i < 16
diff --git a/lib/metasm/metasm/gui/gtk_graph.rb b/lib/metasm/metasm/gui/gtk_graph.rb
index 1291eec9e9..fb52da7b35 100644
--- a/lib/metasm/metasm/gui/gtk_graph.rb
+++ b/lib/metasm/metasm/gui/gtk_graph.rb
@@ -401,7 +401,7 @@ class GraphViewWidget < Gtk::HBox
 		else
 			@selected_boxes = []
 			@caret_box = nil
-			@hl_word = nil
+			#@hl_word = nil
 		end
 		redraw
 	end
@@ -413,6 +413,7 @@ class GraphViewWidget < Gtk::HBox
 
 	def doubleclick(ev)
 		if b = find_box_xy(ev.x, ev.y)
+			@mousemove_origin = nil
 			if @hl_word and @zoom >= 0.90 and @zoom <= 1.1
 				@parent_widget.focus_addr(@hl_word)
 			else
@@ -978,6 +979,10 @@ class GraphViewWidget < Gtk::HBox
 			@curcontext = Graph.new 'testic'
 			@curcontext.root_addrs = dasm_find_roots(addr)
 			gui_update
+			# find an address that can be shown if addr is not
+			if not @curcontext.box.find { |b| b[:line_address].index(addr) }
+				addr = @curcontext.box.first[:line_address].values.first
+			end
 			return focus_addr(addr, false)
 		else
 			return
diff --git a/lib/metasm/metasm/ia32/decode.rb b/lib/metasm/metasm/ia32/decode.rb
index efe476b6a0..460c03afbe 100644
--- a/lib/metasm/metasm/ia32/decode.rb
+++ b/lib/metasm/metasm/ia32/decode.rb
@@ -630,7 +630,7 @@ class Ia32
 		# emulate ret <n>
 		al = cp.typesize[:ptr]
 		if sym.attributes.to_a.include? 'stdcall'
-			argsz = sym.type.args.inject(al) { |sum, a| sum += (cp.sizeof(a) + al - 1) / al * al }
+			argsz = sym.type.args.to_a.inject(al) { |sum, a| sum += (cp.sizeof(a) + al - 1) / al * al }
 			df.backtrace_binding[:esp] = Expression[:esp, :+, argsz]
 		else
 			df.backtrace_binding[:esp] = Expression[:esp, :+, al]