diff --git a/libtorrent/src/piece_picker.cpp b/libtorrent/src/piece_picker.cpp
index dbdba17f0..9bd02f3c4 100755
--- a/libtorrent/src/piece_picker.cpp
+++ b/libtorrent/src/piece_picker.cpp
@@ -334,6 +334,7 @@ namespace libtorrent
 				{
 					++num_requested;
 					blocks_requested = true;
+					TORRENT_ASSERT(i->info[k].num_peers > 0);
 				}
 				if (i->info[k].state == block_info::state_writing)
 				{
diff --git a/libtorrent/src/policy.cpp b/libtorrent/src/policy.cpp
index 2fdc5358a..0599096d5 100755
--- a/libtorrent/src/policy.cpp
+++ b/libtorrent/src/policy.cpp
@@ -294,6 +294,7 @@ namespace libtorrent
 					|| std::find(rq.begin(), rq.end(), *i) != rq.end())
 					continue;
 	
+				TORRENT_ASSERT(p.num_peers(*i) > 0);
 				busy_pieces.push_back(*i);
 				continue;
 			}
@@ -333,6 +334,8 @@ namespace libtorrent
 		p.piece_info(i->piece_index, st);
 		TORRENT_ASSERT(st.requested + st.finished + st.writing == p.blocks_in_piece(i->piece_index));
 #endif
+		TORRENT_ASSERT(p.is_requested(*i));
+		TORRENT_ASSERT(p.num_peers(*i) > 0);
 		c.add_request(*i);
 		c.send_block_requests();
 	}
diff --git a/libtorrent/src/session_impl.cpp b/libtorrent/src/session_impl.cpp
index a93ad7cb0..486f7d31e 100755
--- a/libtorrent/src/session_impl.cpp
+++ b/libtorrent/src/session_impl.cpp
@@ -797,12 +797,13 @@ namespace detail
 
 		INVARIANT_CHECK;
 
-		TORRENT_ASSERT(s.connection_speed > 0);
 		TORRENT_ASSERT(s.file_pool_size > 0);
 
 		// less than 5 seconds unchoke interval is insane
 		TORRENT_ASSERT(s.unchoke_interval >= 5);
 		m_settings = s;
+		if (m_settings.connection_speed <= 0) m_settings.connection_speed = 200;
+
 		m_files.resize(m_settings.file_pool_size);
 		// replace all occurances of '\n' with ' '.
 		std::string::iterator i = m_settings.user_agent.begin();
@@ -2643,20 +2644,23 @@ namespace detail
 
 					TORRENT_ASSERT(*slot_iter == p.index);
 					int slot_index = static_cast<int>(slot_iter - tmp_pieces.begin());
-					unsigned long adler
-						= torrent_ptr->filesystem().piece_crc(
-							slot_index
-							, torrent_ptr->block_size()
-							, p.info);
-
-					const entry& ad = (*i)["adler32"];
+					const entry* ad = i->find_key("adler32");
 	
-					// crc's didn't match, don't use the resume data
-					if (ad.integer() != entry::integer_type(adler))
+					if (ad && ad->type() == entry::int_t)
 					{
-						error = "checksum mismatch on piece "
-							+ boost::lexical_cast<std::string>(p.index);
-						return;
+						unsigned long adler
+							= torrent_ptr->filesystem().piece_crc(
+								slot_index
+								, torrent_ptr->block_size()
+								, p.info);
+
+						// crc's didn't match, don't use the resume data
+						if (ad->integer() != entry::integer_type(adler))
+						{
+							error = "checksum mismatch on piece "
+								+ boost::lexical_cast<std::string>(p.index);
+							return;
+						}
 					}
 
 					tmp_unfinished.push_back(p);
diff --git a/libtorrent/src/torrent_handle.cpp b/libtorrent/src/torrent_handle.cpp
index 635390537..71d0e1628 100755
--- a/libtorrent/src/torrent_handle.cpp
+++ b/libtorrent/src/torrent_handle.cpp
@@ -569,7 +569,7 @@ namespace libtorrent
 					TORRENT_ASSERT(bits == 8 || j == num_bitmask_bytes - 1);
 				}
 				piece_struct["bitmask"] = bitmask;
-
+/*
 				TORRENT_ASSERT(t->filesystem().slot_for(i->index) >= 0);
 				unsigned long adler
 					= t->filesystem().piece_crc(
@@ -578,7 +578,7 @@ namespace libtorrent
 						, i->info);
 
 				piece_struct["adler32"] = adler;
-
+*/
 				// push the struct onto the unfinished-piece list
 				up.push_back(piece_struct);
 			}