diff --git a/nerfstudio/data/datamanagers/full_images_datamanager.py b/nerfstudio/data/datamanagers/full_images_datamanager.py
index 9b2057357..6e041b33d 100644
--- a/nerfstudio/data/datamanagers/full_images_datamanager.py
+++ b/nerfstudio/data/datamanagers/full_images_datamanager.py
@@ -180,26 +180,30 @@ class FullImageDatamanager(DataManager, Generic[TDataset]):
             return data
 
         CONSOLE.log("Caching / undistorting train images")
-        with ThreadPoolExecutor() as executor:
+        with ThreadPoolExecutor(max_workers=2) as executor:
             cached_train = list(
-                executor.map(
-                    process_train_data,
-                    track(
+                track(
+                    executor.map(
+                        process_train_data,
                         range(len(self.train_dataset)),
-                        description="Caching / undistorting train images",
-                        transient=True,
                     ),
+                    description="Caching / undistorting train images",
+                    transient=True,
+                    total=len(self.train_dataset),
                 )
             )
 
         CONSOLE.log("Caching / undistorting eval images")
-        with ThreadPoolExecutor() as executor:
+        with ThreadPoolExecutor(max_workers=2) as executor:
             cached_eval = list(
-                executor.map(
-                    process_eval_data,
-                    track(
-                        range(len(self.eval_dataset)), description="Caching / undistorting eval images", transient=True
+                track(
+                    executor.map(
+                        process_eval_data,
+                        range(len(self.eval_dataset)),
                     ),
+                    description="Caching / undistorting eval images",
+                    transient=True,
+                    total=len(self.eval_dataset),
                 )
             )
 
diff --git a/nerfstudio/data/pixel_samplers.py b/nerfstudio/data/pixel_samplers.py
index ef6238aaf..c24bb4280 100644
--- a/nerfstudio/data/pixel_samplers.py
+++ b/nerfstudio/data/pixel_samplers.py
@@ -178,22 +178,50 @@ class PixelSampler:
         if isinstance(mask, torch.Tensor) and not self.config.ignore_mask:
             indices = self.sample_method(batch_size, num_images, image_height, image_width, mask=mask, device=device)
         else:
-            rand_samples = torch.rand((batch_size, 3), device=device)
-            # convert random samples tto radius and theta
-            radii = self.config.fisheye_crop_radius * torch.sqrt(rand_samples[:, 1])
-            theta = 2.0 * torch.pi * rand_samples[:, 2]
+            # Rejection sampling.
+            valid: Optional[torch.Tensor] = None
+            indices = None
+            while True:
+                samples_needed = batch_size if valid is None else int(batch_size - torch.sum(valid).item())
 
-            # convert radius and theta to x and y between -radii and radii
-            x = radii * torch.cos(theta)
-            y = radii * torch.sin(theta)
+                # Check if done!
+                if samples_needed == 0:
+                    break
 
-            # Multiply by the batch size and height/width to get pixel indices.
-            indices = torch.floor(
-                torch.stack([rand_samples[:, 0], y, x], dim=1)
-                * torch.tensor([num_images, image_height // 2, image_width // 2], device=device)
-                + torch.tensor([0, image_height // 2, image_width // 2], device=device)
-            ).long()
+                rand_samples = torch.rand((samples_needed, 2), device=device)
+                # Convert random samples to radius and theta.
+                radii = self.config.fisheye_crop_radius * torch.sqrt(rand_samples[:, 0])
+                theta = 2.0 * torch.pi * rand_samples[:, 1]
 
+                # Convert radius and theta to x and y.
+                x = (radii * torch.cos(theta) + image_width // 2).long()
+                y = (radii * torch.sin(theta) + image_height // 2).long()
+                sampled_indices = torch.stack(
+                    [torch.randint(0, num_images, size=(samples_needed,), device=device), y, x], dim=-1
+                )
+
+                # Update indices.
+                if valid is None:
+                    indices = sampled_indices
+                    valid = (
+                        (sampled_indices[:, 1] >= 0)
+                        & (sampled_indices[:, 1] < image_height)
+                        & (sampled_indices[:, 2] >= 0)
+                        & (sampled_indices[:, 2] < image_width)
+                    )
+                else:
+                    assert indices is not None
+                    not_valid = ~valid
+                    indices[not_valid, :] = sampled_indices
+                    valid[not_valid] = (
+                        (sampled_indices[:, 1] >= 0)
+                        & (sampled_indices[:, 1] < image_height)
+                        & (sampled_indices[:, 2] >= 0)
+                        & (sampled_indices[:, 2] < image_width)
+                    )
+            assert indices is not None
+
+        assert indices.shape == (batch_size, 3)
         return indices
 
     def collate_image_dataset_batch(self, batch: Dict, num_rays_per_batch: int, keep_full_image: bool = False):
diff --git a/nerfstudio/viewer/render_state_machine.py b/nerfstudio/viewer/render_state_machine.py
index b0afb490c..1fa7c07d9 100644
--- a/nerfstudio/viewer/render_state_machine.py
+++ b/nerfstudio/viewer/render_state_machine.py
@@ -306,7 +306,7 @@ class RenderStateMachine(threading.Thread):
             jpeg_quality=jpg_quality,
             depth=depth,
         )
-        res = f"{selected_output.shape[0]}x{selected_output.shape[1]}px"
+        res = f"{selected_output.shape[1]}x{selected_output.shape[0]}px"
         self.viewer.stats_markdown.content = self.viewer.make_stats_markdown(None, res)
 
     def _calculate_image_res(self, aspect_ratio: float) -> Tuple[int, int]: