diff --git a/src/Ledger.cpp b/src/Ledger.cpp
index 4cdc152d1..af61e7993 100644
--- a/src/Ledger.cpp
+++ b/src/Ledger.cpp
@@ -339,7 +339,7 @@ uint256 Ledger::getHash()
 
 void Ledger::saveAcceptedLedger(bool fromConsensus)
 { // can be called in a different thread
-	cLog(lsTRACE) << "saveAcceptedLedger " << (fromConsensus ? "fromConsensus" : "fromAcquire") << getLedgerSeq();
+	cLog(lsTRACE) << "saveAcceptedLedger " << (fromConsensus ? "fromConsensus " : "fromAcquire ") << getLedgerSeq();
 	static boost::format ledgerExists("SELECT LedgerSeq FROM Ledgers where LedgerSeq = %d;");
 	static boost::format deleteLedger("DELETE FROM Ledgers WHERE LedgerSeq = %d;");
 	static boost::format AcctTransExists("SELECT LedgerSeq FROM AccountTransactions WHERE TransId = '%s';");
@@ -432,9 +432,10 @@ void Ledger::saveAcceptedLedger(bool fromConsensus)
 	if (!fromConsensus)
 		return;
 
+	theApp->getMasterLedger().setFullLedger(shared_from_this());
+
 	theApp->getOPs().pubLedger(shared_from_this());
 
-	theApp->getMasterLedger().setFullLedger(shared_from_this());
 }
 
 Ledger::pointer Ledger::getSQL(const std::string& sql)
diff --git a/src/LedgerHistory.cpp b/src/LedgerHistory.cpp
index c0149431b..45ccaad46 100644
--- a/src/LedgerHistory.cpp
+++ b/src/LedgerHistory.cpp
@@ -50,7 +50,8 @@ Ledger::pointer LedgerHistory::getLedgerBySeq(uint32 index)
 	sl.unlock();
 
 	Ledger::pointer ret(Ledger::loadByIndex(index));
-	if (!ret) return ret;
+	if (!ret)
+		return ret;
 	assert(ret->getLedgerSeq() == index);
 
 	sl.lock();
diff --git a/src/LedgerMaster.cpp b/src/LedgerMaster.cpp
index 2619c893e..872be8920 100644
--- a/src/LedgerMaster.cpp
+++ b/src/LedgerMaster.cpp
@@ -98,6 +98,11 @@ TER LedgerMaster::doTransaction(const SerializedTransaction& txn, TransactionEng
 void LedgerMaster::acquireMissingLedger(const uint256& ledgerHash, uint32 ledgerSeq)
 {
 	mMissingLedger = theApp->getMasterLedgerAcquire().findCreate(ledgerHash);
+	if (mMissingLedger->isComplete())
+	{
+		mMissingLedger = LedgerAcquire::pointer();
+		return;
+	}
 	mMissingSeq = ledgerSeq;
 	if (mMissingLedger->setAccept())
 		mMissingLedger->addOnComplete(boost::bind(&LedgerMaster::missingAcquireComplete, this, _1));
@@ -107,20 +112,20 @@ void LedgerMaster::missingAcquireComplete(LedgerAcquire::pointer acq)
 {
 	boost::recursive_mutex::scoped_lock ml(mLock);
 
-	if (acq->isFailed())
+	if (acq->isFailed() && (mMissingSeq != 0))
 	{
-		if (mMissingSeq != 0)
-		{
-			cLog(lsWARNING) << "Acquire failed, invalidating following ledger " << mMissingSeq + 1;
-			mCompleteLedgers.clearValue(mMissingSeq + 1);
-		}
+		cLog(lsWARNING) << "Acquire failed for " << mMissingSeq;
 	}
 
 	mMissingLedger = LedgerAcquire::pointer();
 	mMissingSeq = 0;
 
 	if (!acq->isFailed())
+	{
+		boost::thread thread(boost::bind(&Ledger::saveAcceptedLedger, acq->getLedger(), false));
+		thread.detach();
 		setFullLedger(acq->getLedger());
+	}
 }
 
 void LedgerMaster::setFullLedger(Ledger::ref ledger)
@@ -139,6 +144,9 @@ void LedgerMaster::setFullLedger(Ledger::ref ledger)
 		}
 	}
 
+	if (mMissingLedger && mMissingLedger->isComplete())
+		mMissingLedger = LedgerAcquire::pointer();
+
 	if (mMissingLedger || !theConfig.FULL_HISTORY)
 		return;
 
@@ -154,11 +162,15 @@ void LedgerMaster::setFullLedger(Ledger::ref ledger)
 		if (prevMissing != RangeSet::RangeSetAbsent)
 		{
 			cLog(lsINFO) << "Ledger " << prevMissing << " is missing";
-			Ledger::pointer nextLedger = getLedgerBySeq(prevMissing);
+			assert(!mCompleteLedgers.hasValue(prevMissing));
+			Ledger::pointer nextLedger = getLedgerBySeq(prevMissing + 1);
 			if (nextLedger)
 				acquireMissingLedger(nextLedger->getParentHash(), nextLedger->getLedgerSeq() - 1);
 			else
-				cLog(lsWARNING) << "We have a ledger gap we can't quite fix";
+			{
+				mCompleteLedgers.clearValue(prevMissing);
+				cLog(lsWARNING) << "We have a gap we can't fix: " << prevMissing + 1;
+			}
 		}
 	}
 }
diff --git a/src/RangeSet.cpp b/src/RangeSet.cpp
index fe218df39..e9c4b38f9 100644
--- a/src/RangeSet.cpp
+++ b/src/RangeSet.cpp
@@ -54,15 +54,18 @@ uint32 RangeSet::getPrev(uint32 v) const
 
 uint32 RangeSet::prevMissing(uint32 v) const
 { // largest number not in the set that is less than the given number
+	cLog(lsTRACE) << "prevMissing(" << v << ") " << toString();
 	for (const_reverse_iterator it = rbegin(); it != rend(); ++it)
 	{
-		if (lower(it) <= v)
-		{
-			if (upper(it) < v)
-				return upper(it) + 1;
+		if ((upper(it) + 1) < v)
+			return upper(it) + 1;
+		if (lower(it) == 0)
+			return RangeSetAbsent;
+		if ((lower(it) - 1) < v)
 			return lower(it) - 1;
-		}
 	}
+	if (v > 0)
+		return v - 1;
 	return RangeSetAbsent;
 }