diff --git a/hexrdgui/image_series_toolbar.py b/hexrdgui/image_series_toolbar.py
index 245e86696..bfc308dc9 100644
--- a/hexrdgui/image_series_toolbar.py
+++ b/hexrdgui/image_series_toolbar.py
@@ -126,13 +126,6 @@ def create_widget(self) -> None:
         self.omega_label = QLabel(self._parent_widget())
         self.omega_label.setVisible(False)
 
-        # Compute the text width for the maximum size label we will have
-        # with the current font, and set the label width to be fixed at
-        # this width. This will prevent the slider from shifting around
-        # while we are sliding.
-        example_label_text = omega_label_text(359.999, 359.999)
-        text_width = self.text_width(example_label_text)
-        self.omega_label.setFixedWidth(text_width)
         self.frame.setAlignment(Qt.AlignmentFlag.AlignCenter)
 
         self.layout = QGridLayout(self.widget)
@@ -164,10 +157,6 @@ def set_range(self, current_tab: bool = False) -> None:
             elif size and not self._show and current_tab:
                 self._show = True
             self.widget.setVisible(self._show)
-            if not self.slider.minimumWidth():
-                parent = self._parent_widget()
-                if parent is not None:
-                    self.slider.setMinimumWidth(parent.width() // 2)
             if not size == self.slider.maximum():
                 self.slider.setMaximum(size)
                 self.frame.setToolTip(f'Max: {size}')
@@ -180,6 +169,7 @@ def set_range(self, current_tab: bool = False) -> None:
             self.widget.setVisible(self._show)
 
         self.update_omega_label_text()
+        self.update_omega_label_minimum_width()
 
     def update_range(self, current_tab: bool) -> None:
         self.set_range(current_tab)
@@ -218,6 +208,23 @@ def update_omega_label_text(self) -> None:
 
         self.omega_label.setText(omega_label_text(*ome_range))  # type: ignore[misc]
 
+    def update_omega_label_minimum_width(self) -> None:
+        """Set a minimum width based on the actual omega data so the
+        slider does not shift around while sliding. Find the pair
+        that produces the longest formatted string."""
+        assert self.omega_label is not None
+        imsd = HexrdConfig().omega_imageseries_dict
+        if imsd is None:
+            return
+
+        first_ims = next(iter(imsd.values()))
+        longest_text = ''
+        for pair in first_ims.omega:
+            text = omega_label_text(round(pair[0], 3), round(pair[1], 3))
+            if len(text) > len(longest_text):
+                longest_text = text
+        self.omega_label.setMinimumWidth(self.text_width(longest_text))
+
     def update_back_forward_buttons(self, val: int) -> None:
         assert self.back_button is not None
         assert self.forward_button is not None
diff --git a/hexrdgui/image_tab_widget.py b/hexrdgui/image_tab_widget.py
index 21ba0b216..1e452924b 100644
--- a/hexrdgui/image_tab_widget.py
+++ b/hexrdgui/image_tab_widget.py
@@ -161,7 +161,13 @@ def load_images(self) -> None:
 
     def change_ims_image(self, pos: int) -> None:
         HexrdConfig().current_imageseries_idx = pos
-        self.update_needed.emit()
+
+        if HexrdConfig().image_mode == ViewType.raw:
+            # Update image data on existing canvases without clearing
+            # and rebuilding tabs, which causes a render flash.
+            self._update_raw_images()
+        else:
+            self.update_needed.emit()
 
         is_aggregated = HexrdConfig().is_aggregated
         has_omegas = HexrdConfig().has_omegas
@@ -178,6 +184,14 @@ def change_ims_image(self, pos: int) -> None:
                 for canvas in self.active_canvases:
                     canvas.redraw_overlay(overlay)
 
+    def _update_raw_images(self) -> None:
+        """Update raw image data on existing canvases without rebuilding tabs."""
+        if HexrdConfig().tab_images:
+            for i, name in enumerate(self.image_names):
+                self.image_canvases[i].load_images(image_names=[name])
+        else:
+            self.image_canvases[0].load_images(image_names=self.image_names)
+
     @Slot(bool)
     def show_toolbar(self, b: bool) -> None:
         self.toolbar_visible = b
diff --git a/hexrdgui/main_window.py b/hexrdgui/main_window.py
index a05100c60..2affa9a9f 100644
--- a/hexrdgui/main_window.py
+++ b/hexrdgui/main_window.py
@@ -663,6 +663,9 @@ def images_loaded(self, enabled: bool = True) -> None:
         self.color_map_editor.reset_range()
         self.update_image_mode_enable_states()
 
+        for overlay in HexrdConfig().overlays:
+            overlay.on_new_images_loaded()
+
     def on_action_open_materials_triggered(self) -> None:
         selected_file, selected_filter = QFileDialog.getOpenFileName(
             self.ui,
diff --git a/hexrdgui/overlays/overlay.py b/hexrdgui/overlays/overlay.py
index 8949d8487..4a68588fa 100644
--- a/hexrdgui/overlays/overlay.py
+++ b/hexrdgui/overlays/overlay.py
@@ -130,9 +130,7 @@ def __init__(
         self.setup_connections()
 
     def setup_connections(self) -> None:
-        from hexrdgui.image_load_manager import ImageLoadManager
-
-        ImageLoadManager().new_images_loaded.connect(self.on_new_images_loaded)
+        pass
 
     @property
     def plot_data_keys(self) -> tuple[str, ...]: