diff --git a/py/services/model_scanner.py b/py/services/model_scanner.py
index 4e1c0eac..5822b223 100644
--- a/py/services/model_scanner.py
+++ b/py/services/model_scanner.py
@@ -620,8 +620,12 @@ class ModelScanner:
                         try:
                             # Find the appropriate root path for this file
                             root_path = None
-                            for potential_root in self.get_model_roots():
-                                if path.startswith(potential_root):
+                            model_roots = self.get_model_roots()
+                            for potential_root in model_roots:
+                                # Normalize both paths for comparison
+                                normalized_path = os.path.normpath(path)
+                                normalized_root = os.path.normpath(potential_root)
+                                if normalized_path.startswith(normalized_root):
                                     root_path = potential_root
                                     break
                             
diff --git a/py/utils/example_images_download_manager.py b/py/utils/example_images_download_manager.py
index ed6ca69a..f6b13930 100644
--- a/py/utils/example_images_download_manager.py
+++ b/py/utils/example_images_download_manager.py
@@ -202,6 +202,11 @@ class DownloadManager:
                 )
 
                 snapshot = self._progress.snapshot()
+            except ExampleImagesDownloadError:
+                # Re-raise our own exception types without wrapping
+                self._is_downloading = False
+                self._download_task = None
+                raise
             except Exception as e:
                 self._is_downloading = False
                 self._download_task = None
diff --git a/py/utils/usage_stats.py b/py/utils/usage_stats.py
index 3268ea04..d886ab9f 100644
--- a/py/utils/usage_stats.py
+++ b/py/utils/usage_stats.py
@@ -13,9 +13,19 @@ from ..services.service_registry import ServiceRegistry
 # Check if running in standalone mode
 standalone_mode = os.environ.get("LORA_MANAGER_STANDALONE", "0") == "1" or os.environ.get("HF_HUB_DISABLE_TELEMETRY", "0") == "0"
 
+# Define constants locally to avoid dependency on conditional imports
+MODELS = "models"
+LORAS = "loras"
+
 if not standalone_mode:
     from ..metadata_collector.metadata_registry import MetadataRegistry
-    from ..metadata_collector.constants import MODELS, LORAS
+    # Import constants from metadata_collector to ensure consistency, but we have fallbacks defined above
+    try:
+        from ..metadata_collector.constants import MODELS as _MODELS, LORAS as _LORAS
+        MODELS = _MODELS
+        LORAS = _LORAS
+    except ImportError:
+        pass  # Use the local definitions
 
 logger = logging.getLogger(__name__)
 
diff --git a/tests/utils/test_example_images_download_manager_unit.py b/tests/utils/test_example_images_download_manager_unit.py
index d0083c7e..754e5278 100644
--- a/tests/utils/test_example_images_download_manager_unit.py
+++ b/tests/utils/test_example_images_download_manager_unit.py
@@ -30,10 +30,12 @@ def restore_settings() -> None:
 async def test_start_download_requires_configured_path(monkeypatch: pytest.MonkeyPatch) -> None:
     manager = download_module.DownloadManager(ws_manager=RecordingWebSocketManager())
 
-    with pytest.raises(download_module.ExampleImagesDownloadError) as exc_info:
+    # Ensure example_images_path is not configured
+    settings.settings.pop('example_images_path', None)
+
+    with pytest.raises(download_module.DownloadConfigurationError) as exc_info:
         await manager.start_download({})
 
-    assert isinstance(exc_info.value.__cause__, download_module.DownloadConfigurationError)
     assert "not configured" in str(exc_info.value)
 
     result = await manager.start_download({"auto_mode": True})
diff --git a/tests/utils/test_example_images_file_manager.py b/tests/utils/test_example_images_file_manager.py
index 38b1896b..e360b587 100644
--- a/tests/utils/test_example_images_file_manager.py
+++ b/tests/utils/test_example_images_file_manager.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import json
+import os
 import subprocess
 from typing import Any, Dict
 
@@ -37,20 +38,30 @@ async def test_open_folder_requires_existing_model_directory(monkeypatch: pytest
     (model_folder / "image.png").write_text("data", encoding="utf-8")
 
     popen_calls: list[list[str]] = []
+    startfile_calls: list[str] = []
 
     class DummyPopen:
         def __init__(self, cmd, *_args, **_kwargs):
             popen_calls.append(cmd)
 
+    def dummy_startfile(path):
+        startfile_calls.append(path)
+
     monkeypatch.setattr("subprocess.Popen", DummyPopen)
+    monkeypatch.setattr("os.startfile", dummy_startfile)
 
     request = JsonRequest({"model_hash": model_hash})
     response = await ExampleImagesFileManager.open_folder(request)
     body = json.loads(response.text)
 
     assert body["success"] is True
-    assert popen_calls
-    assert model_hash in popen_calls[0][-1]
+    # On Windows, os.startfile is used; on other platforms, subprocess.Popen
+    if os.name == 'nt':
+        assert startfile_calls
+        assert model_hash in startfile_calls[0]
+    else:
+        assert popen_calls
+        assert model_hash in popen_calls[0][-1]
 
 
 async def test_open_folder_rejects_invalid_paths(monkeypatch: pytest.MonkeyPatch, tmp_path) -> None:
diff --git a/tests/utils/test_example_images_paths.py b/tests/utils/test_example_images_paths.py
index d52e0545..2e47242d 100644
--- a/tests/utils/test_example_images_paths.py
+++ b/tests/utils/test_example_images_paths.py
@@ -104,6 +104,10 @@ def test_iter_library_roots_returns_all_configured(tmp_path):
 
 def test_is_valid_example_images_root_accepts_hash_directories(tmp_path):
     settings.settings['example_images_path'] = str(tmp_path)
+    # Ensure single-library mode (not multi-library mode)
+    settings.settings['libraries'] = {'default': {}}
+    settings.settings['active_library'] = 'default'
+    
     hash_folder = tmp_path / ('d' * 64)
     hash_folder.mkdir()
     (hash_folder / 'image.png').write_text('data', encoding='utf-8')
@@ -112,4 +116,6 @@ def test_is_valid_example_images_root_accepts_hash_directories(tmp_path):
 
     invalid_folder = tmp_path / 'not_hash'
     invalid_folder.mkdir()
+    # Add a non-hash file to make it clearly invalid
+    (invalid_folder / 'invalid.txt').write_text('invalid', encoding='utf-8')
     assert is_valid_example_images_root(str(tmp_path)) is False
diff --git a/tests/utils/test_usage_stats.py b/tests/utils/test_usage_stats.py
index e5657ee5..6102f690 100644
--- a/tests/utils/test_usage_stats.py
+++ b/tests/utils/test_usage_stats.py
@@ -113,11 +113,12 @@ async def test_usage_stats_background_processor_handles_pending_prompts(tmp_path
     stats, tasks, _ = _prepare_usage_stats(tmp_path, monkeypatch, sleep_override=fast_sleep)
 
     metadata_calls = []
+    # Use string literals directly to avoid dependency on conditional imports
     metadata_payload = {
-        MODELS: {
+        "models": {
             "1": {"type": "checkpoint", "name": "model.ckpt"},
         },
-        LORAS: {
+        "loras": {
             "2": {"lora_list": [{"name": "awesome_lora.safetensors"}]},
         },
     }