diff --git a/qendpoint-core/src/main/java/com/the_qa_company/qendpoint/core/dictionary/impl/kcat/KCatImpl.java b/qendpoint-core/src/main/java/com/the_qa_company/qendpoint/core/dictionary/impl/kcat/KCatImpl.java
index 338bb8c7..e4c0f11a 100644
--- a/qendpoint-core/src/main/java/com/the_qa_company/qendpoint/core/dictionary/impl/kcat/KCatImpl.java
+++ b/qendpoint-core/src/main/java/com/the_qa_company/qendpoint/core/dictionary/impl/kcat/KCatImpl.java
@@ -259,15 +259,16 @@ private KCatImpl(List<?> hdtFileNames, List<? extends Bitmap> deleteBitmaps, HDT
 					// fill the maps based on the deleted triples
 					long c = 0;
 
-					@SuppressWarnings("resource")
 					MultiLayerBitmap bm = MultiLayerBitmap.ofBitmap(deleteBitmap);
 
 					while (searchAll.hasNext()) {
 						TripleID tripleID = searchAll.next();
 
-						iListener.notifyProgress((float) (c++ * 10000 / numberOfElements) / 100f,
-								"building diff bitmaps " + c + "/" + numberOfElements + " (hdt " + index + "/"
-										+ hdts.length + ")");
+						if (c % 10000 == 0) {
+							iListener.notifyProgress((float) (c++ * 10000 / numberOfElements) / 100f,
+									"building diff bitmaps " + c + "/" + numberOfElements + " (hdt " + index + "/"
+											+ hdts.length + ")");
+						}
 
 						long g = quad ? (tripleID.getGraph() - 1) : 0;
 
diff --git a/qendpoint-core/src/main/java/com/the_qa_company/qendpoint/core/hdt/impl/diskimport/CatTreeImpl.java b/qendpoint-core/src/main/java/com/the_qa_company/qendpoint/core/hdt/impl/diskimport/CatTreeImpl.java
index 52ad8b45..9a81d97f 100644
--- a/qendpoint-core/src/main/java/com/the_qa_company/qendpoint/core/hdt/impl/diskimport/CatTreeImpl.java
+++ b/qendpoint-core/src/main/java/com/the_qa_company/qendpoint/core/hdt/impl/diskimport/CatTreeImpl.java
@@ -378,7 +378,8 @@ public HDTResult doGenerationSync(RDFFluxStop fluxStop, HDTSupplier supplier, It
 
 						int idx = 0;
 						for (HDTFile file : files) {
-							Path target = futureHDTLocation.resolveSibling(futureHDTLocation.getFileName() + "." + idx + ".hdt");
+							Path target = futureHDTLocation
+									.resolveSibling(futureHDTLocation.getFileName() + "." + idx + ".hdt");
 							Files.move(file.hdtFile, target, StandardCopyOption.REPLACE_EXISTING);
 							results.add(new MapOnCallHDT(target));
 							idx++;
diff --git a/qendpoint-core/src/main/java/com/the_qa_company/qendpoint/core/storage/QEPMap.java b/qendpoint-core/src/main/java/com/the_qa_company/qendpoint/core/storage/QEPMap.java
index c42bbf21..0cb9dd6a 100644
--- a/qendpoint-core/src/main/java/com/the_qa_company/qendpoint/core/storage/QEPMap.java
+++ b/qendpoint-core/src/main/java/com/the_qa_company/qendpoint/core/storage/QEPMap.java
@@ -282,10 +282,12 @@ public void sync() throws IOException {
 
 						for (int i = 0; i < index1Size.length; i++) {
 							index1Size[i] = header.getLong(shift);
+							index1Location[i] = shift;
 							shift += Long.BYTES;
 						}
 						for (int i = 0; i < index2Size.length; i++) {
 							index2Size[i] = header.getLong(shift);
+							index2Location[i] = shift;
 							shift += Long.BYTES;
 						}
 
@@ -721,6 +723,7 @@ public void syncOld(byte version) throws IOException {
 	 * @throws IOException file state error
 	 */
 	private boolean checkRegen(TripleComponentRole role, boolean created) throws IOException {
+		// predicate doesn't have 2 maps
 		Path map1OriginPath = getMap1OriginPath(role);
 		Path map1DestinationPath = getMap1DestinationPath(role);
 		Path map2OriginPath = getMap2OriginPath(role);
@@ -728,12 +731,14 @@ private boolean checkRegen(TripleComponentRole role, boolean created) throws IOE
 		if (created) {
 			checkNotExists(map1OriginPath);
 			checkNotExists(map1DestinationPath);
-			checkNotExists(map2OriginPath);
-			checkNotExists(map2DestinationPath);
+			if (role != PREDICATE) {
+				checkNotExists(map2OriginPath);
+				checkNotExists(map2DestinationPath);
+			}
 			return true;
 		} else {
 			boolean regen = !(Files.exists(map1OriginPath) && Files.exists(map1DestinationPath)
-					&& Files.exists(map2OriginPath) && Files.exists(map2DestinationPath));
+					&& (role == PREDICATE || (Files.exists(map2OriginPath) && Files.exists(map2DestinationPath))));
 			if (regen) {
 				boolean warn = false;
 				if (Files.exists(map1OriginPath)) {
@@ -746,15 +751,17 @@ private boolean checkRegen(TripleComponentRole role, boolean created) throws IOE
 							map1DestinationPath);
 					warn = true;
 				}
-				if (Files.exists(map2OriginPath)) {
-					logger.warn("{}: map2OriginPath[{}] is present, it will be removed! {}", this, role,
-							map2OriginPath);
-					warn = true;
-				}
-				if (Files.exists(map2DestinationPath)) {
-					logger.warn("{}: map2DestinationPath[{}] is present, it will be removed! {}", this, role,
-							map2DestinationPath);
-					warn = true;
+				if (role != PREDICATE) {
+					if (Files.exists(map2OriginPath)) {
+						logger.warn("{}: map2OriginPath[{}] is present, it will be removed! {}", this, role,
+								map2OriginPath);
+						warn = true;
+					}
+					if (Files.exists(map2DestinationPath)) {
+						logger.warn("{}: map2DestinationPath[{}] is present, it will be removed! {}", this, role,
+								map2DestinationPath);
+						warn = true;
+					}
 				}
 				if (warn) {
 					logger.warn("{}: has a missing file from the grid", this);