Index: trunk/src/org/openstreetmap/josm/data/projection/CustomProjection.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/projection/CustomProjection.java	(revision 12867)
+++ trunk/src/org/openstreetmap/josm/data/projection/CustomProjection.java	(revision 12868)
@@ -666,5 +666,5 @@
         } catch (IllegalArgumentException e) {
             throw new ProjectionConfigurationException(
-                    tr("Unable to parse value ''{1}'' of parameter ''{0}'' as coordinate value.", parameterName, angleStr));
+                    tr("Unable to parse value ''{1}'' of parameter ''{0}'' as coordinate value.", parameterName, angleStr), e);
         }
     }
Index: trunk/src/org/openstreetmap/josm/data/projection/datum/NTV2Proj4DirGridShiftFileSource.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/projection/datum/NTV2Proj4DirGridShiftFileSource.java	(revision 12867)
+++ trunk/src/org/openstreetmap/josm/data/projection/datum/NTV2Proj4DirGridShiftFileSource.java	(revision 12868)
@@ -66,4 +66,5 @@
             } catch (FileNotFoundException ex) {
                 Logging.warn("NTV2 grid shift file not found: " + grid);
+                Logging.trace(ex);
             }
         }
Index: trunk/src/org/openstreetmap/josm/tools/HiDPISupport.java
===================================================================
--- trunk/src/org/openstreetmap/josm/tools/HiDPISupport.java	(revision 12867)
+++ trunk/src/org/openstreetmap/josm/tools/HiDPISupport.java	(revision 12868)
@@ -215,4 +215,5 @@
                         // class is not present in Java 8
                         baseMultiResolutionImageClass = Optional.empty();
+                        Logging.trace(ex);
                     }
                 }
Index: trunk/src/org/openstreetmap/josm/tools/ImageResource.java
===================================================================
--- trunk/src/org/openstreetmap/josm/tools/ImageResource.java	(revision 12867)
+++ trunk/src/org/openstreetmap/josm/tools/ImageResource.java	(revision 12868)
@@ -209,4 +209,5 @@
                 return new ImageIcon(mrImg);
             } catch (NoClassDefFoundError e) {
+                Logging.trace(e);
                 return new ImageIcon(img);
             }