diff --git a/consensus/state.go b/consensus/state.go
index 5cd9b17c..0d82f2ab 100644
--- a/consensus/state.go
+++ b/consensus/state.go
@@ -620,6 +620,9 @@ func (ms *MidState) siafundElement(ts V1TransactionSupplement, id types.SiafundO
 }
 
 func (ms *MidState) fileContractElement(ts V1TransactionSupplement, id types.FileContractID) (types.FileContractElement, bool) {
+	if rev, ok := ms.revs[types.Hash256(id)]; ok {
+		return *rev, true
+	}
 	if i, ok := ms.created[types.Hash256(id)]; ok {
 		return ms.fces[i], true
 	}
diff --git a/consensus/validation.go b/consensus/validation.go
index 40b8d6ac..8004f705 100644
--- a/consensus/validation.go
+++ b/consensus/validation.go
@@ -238,11 +238,15 @@ func validateSiafunds(ms *MidState, txn types.Transaction, ts V1TransactionSuppl
 }
 
 func validateFileContracts(ms *MidState, txn types.Transaction, ts V1TransactionSupplement) error {
+	v2RequireHeight := ms.base.Network.HardforkV2.RequireHeight
+
 	for i, fc := range txn.FileContracts {
 		if fc.WindowStart < ms.base.childHeight() {
 			return fmt.Errorf("file contract %v has window that starts in the past", i)
 		} else if fc.WindowEnd <= fc.WindowStart {
 			return fmt.Errorf("file contract %v has window that ends before it begins", i)
+		} else if fc.WindowStart >= v2RequireHeight {
+			return fmt.Errorf("file contract %v has window that starts after v2 hardfork", i)
 		}
 		var validSum, missedSum types.Currency
 		for _, output := range fc.ValidProofOutputs {
@@ -265,6 +269,8 @@ func validateFileContracts(ms *MidState, txn types.Transaction, ts V1Transaction
 			return fmt.Errorf("file contract revision %v has window that starts in the past", i)
 		} else if fcr.FileContract.WindowEnd <= fcr.FileContract.WindowStart {
 			return fmt.Errorf("file contract revision %v has window that ends before it begins", i)
+		} else if fcr.WindowStart >= v2RequireHeight {
+			return fmt.Errorf("file contract %v has window that starts after v2 hardfork", i)
 		} else if txid, ok := ms.spent(types.Hash256(fcr.ParentID)); ok {
 			return fmt.Errorf("file contract revision %v conflicts with previous proof or revision (in %v)", i, txid)
 		}
diff --git a/consensus/validation_test.go b/consensus/validation_test.go
index 40f37946..52908b9c 100644
--- a/consensus/validation_test.go
+++ b/consensus/validation_test.go
@@ -365,6 +365,9 @@ func TestValidateBlock(t *testing.T) {
 		t.Fatal(err)
 	}
 
+	// clear signatures to avoid false positives
+	validBlock.Transactions[0].Signatures = nil
+
 	// tests with correct signatures
 	{
 		tests := []struct {
@@ -658,6 +661,32 @@ func TestValidateBlock(t *testing.T) {
 					txn.FileContractRevisions = append(txn.FileContractRevisions, newRevision)
 				},
 			},
+			{
+				"misordered revisions",
+				func(b *types.Block) {
+					newRevision := b.Transactions[0].FileContractRevisions[0]
+					newRevision.RevisionNumber = 99
+
+					b.Transactions = append(b.Transactions, types.Transaction{
+						FileContractRevisions: []types.FileContractRevision{newRevision},
+					})
+
+					// set the initial revision number to be higher than the new
+					// revision
+					b.Transactions[0].FileContractRevisions[0].RevisionNumber = 100
+				},
+			},
+			{
+				"duplicate revisions in same block",
+				func(b *types.Block) {
+					txn := &b.Transactions[0]
+					newRevision := txn.FileContractRevisions[0]
+
+					b.Transactions = append(b.Transactions, types.Transaction{
+						FileContractRevisions: []types.FileContractRevision{newRevision},
+					})
+				},
+			},
 			{
 				"double-spent siacoin input",
 				func(b *types.Block) {
@@ -685,11 +714,15 @@ func TestValidateBlock(t *testing.T) {
 		for _, test := range tests {
 			corruptBlock := deepCopyBlock(validBlock)
 			test.corrupt(&corruptBlock)
-			signTxn(&corruptBlock.Transactions[0])
+			for i := range corruptBlock.Transactions {
+				signTxn(&corruptBlock.Transactions[i])
+			}
 			findBlockNonce(cs, &corruptBlock)
 
 			if err := ValidateBlock(cs, corruptBlock, db.supplementTipBlock(corruptBlock)); err == nil {
 				t.Fatalf("accepted block with %v", test.desc)
+			} else {
+				t.Log(test.desc, err)
 			}
 		}
 	}
@@ -758,6 +791,9 @@ func TestValidateBlock(t *testing.T) {
 		}
 		for _, test := range tests {
 			corruptBlock := deepCopyBlock(validBlock)
+			for i := range corruptBlock.Transactions {
+				signTxn(&corruptBlock.Transactions[i])
+			}
 			test.corrupt(&corruptBlock)
 			findBlockNonce(cs, &corruptBlock)