diff --git a/rtengine/rawimage.h b/rtengine/rawimage.h
index 88ef5d710..b741a7ffc 100644
--- a/rtengine/rawimage.h
+++ b/rtengine/rawimage.h
@@ -274,37 +274,37 @@ public:
     {
         return profile_data;
     }
-    IMFILE *get_file()
+    IMFILE *get_file() const
     {
         return ifp;
     }
     bool is_supportedThumb() const ;
     bool is_jpegThumb() const ;
     bool is_ppmThumb() const ;
-    int get_thumbOffset()
+    int get_thumbOffset() const
     {
         return int(thumb_offset);
     }
-    int get_thumbWidth()
+    int get_thumbWidth() const
     {
         return int(thumb_width);
     }
-    int get_thumbHeight()
+    int get_thumbHeight() const
     {
         return int(thumb_height);
     }
-    int get_thumbBPS()
+    int get_thumbBPS() const
     {
         return thumb_load_raw ? 16 : 8;
     }
     bool get_thumbSwap() const;
-    unsigned get_thumbLength()
+    unsigned get_thumbLength() const
     {
         return thumb_length;
     }
-    bool zeroIsBad()
+    bool zeroIsBad() const
     {
-        return zero_is_bad == 1 ? true : false;
+        return zero_is_bad == 1;
     }
 
 public:
diff --git a/rtengine/rtthumbnail.cc b/rtengine/rtthumbnail.cc
index 4710f3fe8..77e260985 100644
--- a/rtengine/rtthumbnail.cc
+++ b/rtengine/rtthumbnail.cc
@@ -41,6 +41,25 @@
 #include "StopWatch.h"
 
 
+namespace
+{
+
+    bool checkRawImageThumb(const rtengine::RawImage& raw_image)
+    {
+        if (!raw_image.is_supportedThumb()) {
+            return false;
+        }
+
+        const std::size_t length =
+            fdata(raw_image.get_thumbOffset(), raw_image.get_file())[1] != 0xD8 && raw_image.is_ppmThumb()
+                ? raw_image.get_thumbWidth() * raw_image.get_thumbHeight() * (raw_image.get_thumbBPS() / 8) * 3
+                : raw_image.get_thumbLength();
+
+        return raw_image.get_thumbOffset() + length < raw_image.get_file()->size;
+    }
+
+}
+
 extern Options options;
 
 namespace rtengine
@@ -175,8 +194,8 @@ Thumbnail* Thumbnail::loadQuickFromRaw (const Glib::ustring& fname, RawMetaDataL
 
     int err = 1;
 
-    // see if it is something we support
-    if ( ri->is_supportedThumb() && ri->get_thumbOffset() < ri->get_file()->size ) {
+    // See if it is something we support
+    if (checkRawImageThumb(*ri)) {
         const char* data((const char*)fdata(ri->get_thumbOffset(), ri->get_file()));
 
         if ( (unsigned char)data[1] == 0xd8 ) {
@@ -491,6 +510,17 @@ Thumbnail* Thumbnail::loadFromRaw (const Glib::ustring& fname, RawMetaDataLocati
         tmph = high;
     }
 
+    const bool rotate_90 =
+        rotate
+        && (
+            ri->get_rotateDegree() == 90
+            || ri->get_rotateDegree() == 270
+        );
+
+    if (rotate_90) {
+        std::swap(tmpw, tmph);
+    }
+
     if (fixwh == 1) { // fix height, scale width
         w = tmpw * h / tmph;
     } else {
@@ -501,8 +531,11 @@ Thumbnail* Thumbnail::loadFromRaw (const Glib::ustring& fname, RawMetaDataLocati
         delete tpp->thumbImg;
     }
 
-    tpp->thumbImg = nullptr;
-    tpp->thumbImg = resizeTo<Image16>(w, h, TI_Bilinear, tmpImg);
+    if (rotate_90) {
+        tpp->thumbImg = resizeTo<Image16>(h, w, TI_Bilinear, tmpImg);
+    } else {
+        tpp->thumbImg = resizeTo<Image16>(w, h, TI_Bilinear, tmpImg);
+    }
     delete tmpImg;
 
 
diff --git a/rtgui/cropwindow.cc b/rtgui/cropwindow.cc
index e6a9d6e42..7ff139e81 100644
--- a/rtgui/cropwindow.cc
+++ b/rtgui/cropwindow.cc
@@ -2110,9 +2110,14 @@ void CropWindow::updateHoveredPicker (rtengine::Coord *imgPos)
     }
     LockableColorPicker::Validity validity = checkValidity (hoveredPicker, cropPos);
     hoveredPicker->setValidity (validity);
-    if (validity == LockableColorPicker::Validity::INSIDE) {
-        cropHandler.colorPick(cropPos, r, g, b, rpreview, gpreview, bpreview, hoveredPicker->getSize());
-        hoveredPicker->setRGB (r, g, b, rpreview, gpreview, bpreview);
+
+    {
+        MyMutex::MyLock lock(cropHandler.cimg);
+
+        if (validity == LockableColorPicker::Validity::INSIDE) {
+            cropHandler.colorPick(cropPos, r, g, b, rpreview, gpreview, bpreview, hoveredPicker->getSize());
+            hoveredPicker->setRGB (r, g, b, rpreview, gpreview, bpreview);
+        }
     }
 }
 void CropWindow::changeZoom  (int zoom, bool notify, int centerx, int centery)
@@ -2477,6 +2482,7 @@ void CropWindow::drawObservedFrame (Cairo::RefPtr<Cairo::Context> cr, int rw, in
 
 void CropWindow::cropImageUpdated ()
 {
+    MyMutex::MyLock lock(cropHandler.cimg);
 
     for (auto colorPicker : colorPickers) {
         Coord imgPos, cropPos;