diff --git a/intern/cycles/blender/curves.cpp b/intern/cycles/blender/curves.cpp
index fd7e05062e6..1ac2e250ee5 100644
--- a/intern/cycles/blender/curves.cpp
+++ b/intern/cycles/blender/curves.cpp
@@ -386,7 +386,7 @@ static void ExportCurveSegments(Scene *scene, Hair *hair, ParticleCurveData *CDa
 
   /* check allocation */
   if ((hair->get_curve_keys().size() != num_keys) || (hair->num_curves() != num_curves)) {
-    LOG_WARNING << "Hair memory allocation failed, clearing data.";
+    LOG_ERROR << "Hair memory allocation failed, clearing data.";
     hair->clear(true);
   }
 }
diff --git a/intern/cycles/device/cuda/device_impl.cpp b/intern/cycles/device/cuda/device_impl.cpp
index 050fca03158..6d0cc72d277 100644
--- a/intern/cycles/device/cuda/device_impl.cpp
+++ b/intern/cycles/device/cuda/device_impl.cpp
@@ -339,13 +339,13 @@ string CUDADevice::compile_kernel(const string &common_cflags,
   const int nvcc_cuda_version = cuewCompilerVersion();
   LOG_INFO << "Found nvcc " << nvcc << ", CUDA version " << nvcc_cuda_version << ".";
   if (nvcc_cuda_version < 101) {
-    LOG_WARNING << "Unsupported CUDA version " << nvcc_cuda_version / 10 << "."
-                << nvcc_cuda_version % 10 << ", you need CUDA 10.1 or newer";
+    LOG_ERROR << "Unsupported CUDA version " << nvcc_cuda_version / 10 << "."
+              << nvcc_cuda_version % 10 << ", you need CUDA 10.1 or newer";
     return string();
   }
   if (!(nvcc_cuda_version >= 102 && nvcc_cuda_version < 130)) {
-    LOG_WARNING << "CUDA version " << nvcc_cuda_version / 10 << "." << nvcc_cuda_version % 10
-                << "CUDA 10.1 to 12 are officially supported.";
+    LOG_ERROR << "CUDA version " << nvcc_cuda_version / 10 << "." << nvcc_cuda_version % 10
+              << "CUDA 10.1 to 12 are officially supported.";
   }
 
   double starttime = time_dt();
diff --git a/intern/cycles/hydra/field.cpp b/intern/cycles/hydra/field.cpp
index 0367a02111e..abe148a9ae2 100644
--- a/intern/cycles/hydra/field.cpp
+++ b/intern/cycles/hydra/field.cpp
@@ -44,10 +44,10 @@ class HdCyclesVolumeLoader : public VDBImageLoader {
       }
     }
     catch (const openvdb::IoError &e) {
-      LOG_WARNING << "Error loading OpenVDB file: " << e.what();
+      LOG_ERROR << "Error loading OpenVDB file: " << e.what();
     }
     catch (...) {
-      LOG_WARNING << "Error loading OpenVDB file: Unknown error";
+      LOG_ERROR << "Error loading OpenVDB file: Unknown error";
     }
   }
 };
diff --git a/intern/cycles/scene/colorspace.cpp b/intern/cycles/scene/colorspace.cpp
index b16ff29f77c..7d8256acaa5 100644
--- a/intern/cycles/scene/colorspace.cpp
+++ b/intern/cycles/scene/colorspace.cpp
@@ -46,7 +46,7 @@ static void check_invalidate_caches()
     config = OCIO::GetCurrentConfig();
   }
   catch (const OCIO::Exception &exception) {
-    LOG_WARNING << "OCIO config error: " << exception.what();
+    LOG_ERROR << "OCIO config error: " << exception.what();
     return;
   }
 
@@ -80,7 +80,7 @@ ColorSpaceProcessor *ColorSpaceManager::get_processor(ustring colorspace)
     config = OCIO::GetCurrentConfig();
   }
   catch (const OCIO::Exception &exception) {
-    LOG_WARNING << "OCIO config error: " << exception.what();
+    LOG_ERROR << "OCIO config error: " << exception.what();
     return nullptr;
   }
 
@@ -128,7 +128,7 @@ bool ColorSpaceManager::colorspace_is_data(ustring colorspace)
     config = OCIO::GetCurrentConfig();
   }
   catch (const OCIO::Exception &exception) {
-    LOG_WARNING << "OCIO config error: " << exception.what();
+    LOG_ERROR << "OCIO config error: " << exception.what();
     return false;
   }
 
@@ -208,7 +208,7 @@ ustring ColorSpaceManager::detect_known_colorspace(ustring colorspace,
       config = OCIO::GetCurrentConfig();
     }
     catch (const OCIO::Exception &exception) {
-      LOG_WARNING << "OCIO config error: " << exception.what();
+      LOG_ERROR << "OCIO config error: " << exception.what();
       return u_colorspace_raw;
     }
 
diff --git a/intern/cycles/scene/image_oiio.cpp b/intern/cycles/scene/image_oiio.cpp
index b58f4c31646..ebe103f99de 100644
--- a/intern/cycles/scene/image_oiio.cpp
+++ b/intern/cycles/scene/image_oiio.cpp
@@ -19,23 +19,28 @@ bool OIIOImageLoader::load_metadata(const ImageDeviceFeatures & /*features*/,
                                     ImageMetaData &metadata)
 {
   /* Perform preliminary checks, with meaningful logging. */
+  if (filepath.empty()) {
+    return false;
+  }
+
   if (!path_exists(filepath.string())) {
-    LOG_WARNING << "File '" << filepath.string() << "' does not exist.";
+    LOG_ERROR << "Image file '" << filepath.string() << "' does not exist.";
     return false;
   }
   if (path_is_directory(filepath.string())) {
-    LOG_WARNING << "File '" << filepath.string() << "' is a directory, cannot use as image.";
+    LOG_ERROR << "Image file '" << filepath.string() << "' is a directory, cannot use as image.";
     return false;
   }
 
   unique_ptr<ImageInput> in(ImageInput::create(filepath.string()));
-
   if (!in) {
+    LOG_ERROR << "Image file '" << filepath.string() << "' failed to load.";
     return false;
   }
 
   ImageSpec spec;
   if (!in->open(filepath.string(), spec)) {
+    LOG_ERROR << "Image file '" << filepath.string() << "' failed to open.";
     return false;
   }
 
diff --git a/intern/cycles/util/nanovdb.cpp b/intern/cycles/util/nanovdb.cpp
index c8281c9fac8..5569ca1cfe3 100644
--- a/intern/cycles/util/nanovdb.cpp
+++ b/intern/cycles/util/nanovdb.cpp
@@ -272,10 +272,10 @@ struct ToNanoOp {
 #  endif
     }
     catch (const std::exception &e) {
-      LOG_WARNING << "Error converting OpenVDB to NanoVDB grid: " << e.what();
+      LOG_ERROR << "Error converting OpenVDB to NanoVDB grid: " << e.what();
     }
     catch (...) {
-      LOG_WARNING << "Error converting OpenVDB to NanoVDB grid: Unknown error";
+      LOG_ERROR << "Error converting OpenVDB to NanoVDB grid: Unknown error";
     }
     return true;
   }