diff --git a/src/adaptors/UBImportDocumentSetAdaptor.cpp b/src/adaptors/UBImportDocumentSetAdaptor.cpp
index cdc9250b..8d74bf93 100644
--- a/src/adaptors/UBImportDocumentSetAdaptor.cpp
+++ b/src/adaptors/UBImportDocumentSetAdaptor.cpp
@@ -94,11 +94,17 @@ QFileInfoList UBImportDocumentSetAdaptor::importData(const QString &zipFile, con
 
     foreach(QFileInfo readDir, tDir.entryInfoList(QDir::Dirs | QDir::NoDotAndDotDot | QDir::Hidden , QDir::Name)) {
         QString newFileName = readDir.fileName();
-        if (QFileInfo(destination + "/" + readDir.fileName()).exists()) {
-            newFileName = QFileInfo(UBPersistenceManager::persistenceManager()->generateUniqueDocumentPath(tmpDir)).fileName();
+        if (QFileInfo(destination + "/" + newFileName).exists())
+        {
+            //if the generateUniqueDocumentPath is called twice in the same millisecond, the destination files are overwritten
+            do
+            {
+                newFileName = QFileInfo(UBPersistenceManager::persistenceManager()->generateUniqueDocumentPath(tmpDir)).fileName();
+            } while (QFileInfo(destination + "/" + newFileName).exists());
         }
+
         QString newFilePath = destination + "/" + newFileName;
-        if (UBFileSystemUtils::copy(readDir.absoluteFilePath(), newFilePath)) {
+        if (UBFileSystemUtils::copy(readDir.absoluteFilePath(), newFilePath, true)) {
             result.append(newFilePath);
         }
     }
diff --git a/src/board/UBBoardController.cpp b/src/board/UBBoardController.cpp
index b3b913a2..99c5999f 100644
--- a/src/board/UBBoardController.cpp
+++ b/src/board/UBBoardController.cpp
@@ -780,6 +780,7 @@ void UBBoardController::deleteScene(int nIndex)
         scIndexes << nIndex;
         deletePages(scIndexes);
         selectedDocument()->setMetaData(UBSettings::documentUpdatedAt, UBStringUtils::toUtcIsoDateTime(QDateTime::currentDateTime()));
+        selectedDocument()->setMetaData(UBSettings::documentPageCount, QString::number(pageCount()-1));
 
         if (nIndex >= pageCount())
             nIndex = pageCount()-1;
diff --git a/src/document/UBDocumentController.cpp b/src/document/UBDocumentController.cpp
index 03d676fb..bfb75bff 100644
--- a/src/document/UBDocumentController.cpp
+++ b/src/document/UBDocumentController.cpp
@@ -2786,6 +2786,8 @@ void UBDocumentController::importFile()
     if (fileInfo.suffix().toLower() == "ubx") {
         UBPersistenceManager::persistenceManager()->createDocumentProxiesStructure(docManager->importUbx(filePath, UBSettings::userDocumentDirectory()), true);
 
+        emit documentThumbnailsUpdated(this); // some documents might have been overwritten while not having the same page count
+
     } else {
         UBSettings::settings()->lastImportFilePath->set(QVariant(fileInfo.absolutePath()));
 
diff --git a/src/frameworks/UBFileSystemUtils.cpp b/src/frameworks/UBFileSystemUtils.cpp
index 59c72aad..6c5ae6d6 100644
--- a/src/frameworks/UBFileSystemUtils.cpp
+++ b/src/frameworks/UBFileSystemUtils.cpp
@@ -121,7 +121,7 @@ bool UBFileSystemUtils::copyFile(const QString &source, const QString &destinati
 bool UBFileSystemUtils::copy(const QString &source, const QString &destination, bool overwrite)
 {
     if (QFileInfo(source).isDir()) {
-        return copyDir(source, destination);
+        return copyDir(source, destination, overwrite);
     } else {
         return copyFile(source, destination, overwrite);
     }
@@ -280,7 +280,7 @@ bool UBFileSystemUtils::deleteDir(const QString& pDirPath)
 }
 
 
-bool UBFileSystemUtils::copyDir(const QString& pSourceDirPath, const QString& pTargetDirPath)
+bool UBFileSystemUtils::copyDir(const QString& pSourceDirPath, const QString& pTargetDirPath, bool overwite)
 {
     if (pSourceDirPath == "" || pSourceDirPath == "." || pSourceDirPath == "..")
         return false;
@@ -304,8 +304,7 @@ bool UBFileSystemUtils::copyDir(const QString& pSourceDirPath, const QString& pT
             }
             else
             {
-                QFile f(pSourceDirPath + "/" + dirContent.fileName());
-                successSoFar = f.copy(pTargetDirPath + "/" + dirContent.fileName());
+                successSoFar = copyFile(pSourceDirPath + "/" + dirContent.fileName(), pTargetDirPath + "/" + dirContent.fileName(), overwite);
             }
         }
         else
diff --git a/src/frameworks/UBFileSystemUtils.h b/src/frameworks/UBFileSystemUtils.h
index da74b069..a145177d 100644
--- a/src/frameworks/UBFileSystemUtils.h
+++ b/src/frameworks/UBFileSystemUtils.h
@@ -62,7 +62,7 @@ class UBFileSystemUtils : public QObject
 
         static bool deleteDir(const QString& pDirPath);
 
-        static bool copyDir(const QString& pSourceDirPath, const QString& pTargetDirPath);
+        static bool copyDir(const QString& pSourceDirPath, const QString& pTargetDirPath, bool overwrite = false);
 
         static bool moveDir(const QString& pSourceDirPath, const QString& pTargetDirPath);