diff --git a/app/src/processing/app/contrib/ModeContribution.java b/app/src/processing/app/contrib/ModeContribution.java
index 9ed1c2672..bcc0b4b0d 100644
--- a/app/src/processing/app/contrib/ModeContribution.java
+++ b/app/src/processing/app/contrib/ModeContribution.java
@@ -134,11 +134,11 @@ public class ModeContribution extends LocalContribution {
           try {
             contribModes.add(new ModeContribution(base, folder, null));
           } catch (NoSuchMethodError nsme) {
-            System.err.println(folder.getName() + " contains an incompatible Mode");
-            System.err.println(nsme.getMessage());
+            System.err.println(folder.getName() + " is not compatible with this version of Processing");
+//            System.err.println(nsme.getMessage());
           } catch (NoClassDefFoundError ncdfe) {
-            System.err.println(folder.getName() + " contains an incompatible Mode");
-            System.err.println(ncdfe.getMessage());
+            System.err.println(folder.getName() + " is not compatible with this version of Processing");
+//            System.err.println(ncdfe.getMessage());
           } catch (IgnorableException ig) {
             Base.log(ig.getMessage());
           } catch (Throwable e) {
diff --git a/app/src/processing/app/contrib/ToolContribution.java b/app/src/processing/app/contrib/ToolContribution.java
index 4e6dbb764..f5d5479a1 100644
--- a/app/src/processing/app/contrib/ToolContribution.java
+++ b/app/src/processing/app/contrib/ToolContribution.java
@@ -46,6 +46,11 @@ public class ToolContribution extends LocalContribution implements Tool {
     } catch (VerifyError ve) {  // incompatible
       // avoid the excessive error spew that happens here
 
+    } catch (NoClassDefFoundError ncdfe) {
+      if (ncdfe.getMessage().contains("processing/app/Editor")) {
+        System.err.println("The Editor class has moved to the processing.app.ui package in Processing 3");
+      }
+
     } catch (Throwable e) {  // unknown error
       e.printStackTrace();
     }
@@ -105,7 +110,7 @@ public class ToolContribution extends LocalContribution implements Tool {
 //  }
 
 
-  static public ArrayList<ToolContribution> loadAll(File toolsFolder) {
+  static public List<ToolContribution> loadAll(File toolsFolder) {
     File[] list = ContributionType.TOOL.listCandidates(toolsFolder);
     ArrayList<ToolContribution> outgoing = new ArrayList<ToolContribution>();
     // If toolsFolder does not exist or is inaccessible (stranger things have
diff --git a/app/src/processing/app/ui/Editor.java b/app/src/processing/app/ui/Editor.java
index 5eb732df8..b318e51d7 100644
--- a/app/src/processing/app/ui/Editor.java
+++ b/app/src/processing/app/ui/Editor.java
@@ -1288,6 +1288,11 @@ public abstract class Editor extends JFrame implements RunnerListener {
         System.err.println("The " + ncdfe.getMessage() + " class is no longer available.");
         Base.loge("Incompatible Tool found during tool.init()", ncdfe);
 
+      } catch (AbstractMethodError ame) {
+        System.err.println("\"" + tool.getMenuTitle() + "\" is not " +
+                           "compatible with this version of Processing");
+//        ame.printStackTrace();
+
       } catch (Error err) {
         System.err.println("An error occurred inside \"" + tool.getMenuTitle() + "\"");
         err.printStackTrace();
diff --git a/core/todo.txt b/core/todo.txt
index fde528788..b52e7d504 100644
--- a/core/todo.txt
+++ b/core/todo.txt
@@ -48,6 +48,7 @@ X   https://github.com/processing/processing/issues/3417
 X change how font metrics are pulled to fix text width issues
 X check alpha when image extension is "unknown"
 X   https://github.com/processing/processing/issues/3442
+X add support for more Image types (BGR) with PImage(java.awt.Image) constructor
 
 threading headaches
 X sketch not always showing with empty draw()
@@ -133,12 +134,6 @@ _   on Export to Application, this has an impact
 _ update wiki/docs to say "don't override sketchXxxx() methods"
 
 
-_ change "PythonMode contains an incompatible Mode" message
-_   to "PythonMode is not compatible with Processing 3"
-_ another "incompatible tool" case
-java.lang.AbstractMethodError
-  at processing.app.contrib.ToolContribution.init(ToolContribution.java:134)
-
 beta
 X move Java2D and JavaFX classes to their own packages
 _   make notes about this in the README
diff --git a/todo.txt b/todo.txt
index c6e3b0b5c..6ae0f9424 100644
--- a/todo.txt
+++ b/todo.txt
@@ -18,6 +18,12 @@ X   https://github.com/processing/processing/issues/3394
 X Tweak mode broken (re: new settings() function)
 X   https://github.com/processing/processing/issues/3435
 X   looks like 'class' def from tweak needs to go below setup
+X change "PythonMode contains an incompatible Mode" message
+X   to "PythonMode is not compatible with Processing 3"
+X another "incompatible tool" case
+X   java.lang.AbstractMethodError
+X     at processing.app.contrib.ToolContribution.init(ToolContribution.java:134)
+X   unfortunately happens at a level where we can only println about it
 
 manager
 X changed compatibleModesList to modes in examples.properties
@@ -83,6 +89,7 @@ contribs pending
 _ Ready to add contributed example packages?
 _   https://github.com/processing/processing/issues/2953
 
+
 beta
 _ make modes load their parent class
 _   https://github.com/processing/processing/issues/3443