diff --git a/diylc/diylc-core/src/org/diylc/log4j.properties b/diylc/diylc-core/src/org/diylc/log4j.properties
deleted file mode 100644
index df80fe66..00000000
--- a/diylc/diylc-core/src/org/diylc/log4j.properties
+++ /dev/null
@@ -1,9 +0,0 @@
-log4j.rootLogger = DEBUG, fileout, stdout
-log4j.appender.fileout = com.diyfever.gui.miscutils.NewLogForEachRunFileAppender
-log4j.appender.fileout.layout.ConversionPattern = %d{ABSOLUTE} %5p [%t] %c{1} - %m%n
-log4j.appender.fileout.layout = org.apache.log4j.PatternLayout
-log4j.appender.fileout.File = log/log.log
-
-log4j.appender.stdout = org.apache.log4j.ConsoleAppender
-log4j.appender.stdout.layout.ConversionPattern = %d{ABSOLUTE} %5p [%t] %c{1} - %m%n
-log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
\ No newline at end of file
diff --git a/diylc/diylc-core/src/org/diylc/presenter/Presenter.java b/diylc/diylc-core/src/org/diylc/presenter/Presenter.java
index b7a879b9..a8702158 100644
--- a/diylc/diylc-core/src/org/diylc/presenter/Presenter.java
+++ b/diylc/diylc-core/src/org/diylc/presenter/Presenter.java
@@ -432,7 +432,7 @@ public class Presenter implements IPlugInPort {
       try {
         componentTypeClasses = Utils.getClasses("org.diylc.components");
         File libraryFile = new File("library");
-        if (libraryFile.exists() && libraryFile.isDirectory()) {
+        if (libraryFile.exists() && libraryFile.isDirectory() && !Utils.isMac()) {
           LOG.info("Loading additional library JARs");
           try {
             List<Class<?>> additionalComponentTypeClasses =
diff --git a/diylc/diylc-core/src/org/diylc/presenter/update.xml b/diylc/diylc-core/src/org/diylc/presenter/update.xml
index 4920ee9b..2a5d30d1 100644
--- a/diylc/diylc-core/src/org/diylc/presenter/update.xml
+++ b/diylc/diylc-core/src/org/diylc/presenter/update.xml
@@ -3385,5 +3385,25 @@
 			</changes>
 			<url>https://github.com/bancika/diy-layout-creator/releases</url>
 		</org.diylc.appframework.update.Version>
+		<org.diylc.appframework.update.Version>
+			<versionNumber>
+				<major>4</major>
+				<minor>14</minor>
+				<build>0</build>
+			</versionNumber>
+			<releaseDate>2020-12-20 00:00:00.000 CET</releaseDate>
+			<name></name>
+			<changes>
+				<org.diylc.appframework.update.Change>
+					<changeType>BUG_FIX</changeType>
+					<description>macOS: splash screen hangs for several minutes on some machines</description>
+				</org.diylc.appframework.update.Change>
+				<org.diylc.appframework.update.Change>
+					<changeType>BUG_FIX</changeType>
+					<description>macOS: logging does not produce files on Mac OS Sierra</description>
+				</org.diylc.appframework.update.Change>
+			</changes>
+			<url>https://github.com/bancika/diy-layout-creator/releases</url>
+		</org.diylc.appframework.update.Version>
 	</a>
 </java.util.Arrays_-ArrayList>
diff --git a/diylc/diylc-library/lib/diylc-core.jar b/diylc/diylc-library/lib/diylc-core.jar
index a464823a..ac171966 100644
Binary files a/diylc/diylc-library/lib/diylc-core.jar and b/diylc/diylc-library/lib/diylc-core.jar differ
diff --git a/diylc/diylc-swing/lib/diylc-core.jar b/diylc/diylc-swing/lib/diylc-core.jar
index a464823a..ac171966 100644
Binary files a/diylc/diylc-swing/lib/diylc-core.jar and b/diylc/diylc-swing/lib/diylc-core.jar differ
diff --git a/diylc/diylc-swing/library/main.jar b/diylc/diylc-swing/library/main.jar
index 8e7b3157..6f2e943d 100644
Binary files a/diylc/diylc-swing/library/main.jar and b/diylc/diylc-swing/library/main.jar differ
diff --git a/diylc/diylc-swing/src/org/diylc/DIYLCStarter.java b/diylc/diylc-swing/src/org/diylc/DIYLCStarter.java
index 44d490fa..6f64725c 100644
--- a/diylc/diylc-swing/src/org/diylc/DIYLCStarter.java
+++ b/diylc/diylc-swing/src/org/diylc/DIYLCStarter.java
@@ -46,6 +46,8 @@ import com.apple.eawt.AppEvent;
 import com.apple.eawt.Application;
 import com.thoughtworks.xstream.XStream;
 
+import ca.cgjennings.jvm.JarLoader;
+
 /**
  * Main class that runs DIYLC.
  * 
@@ -103,6 +105,8 @@ public class DIYLCStarter {
 
     // disable HIGHLIGHT_CONTINUITY_AREA config, keep it transient
     ConfigurationManager.getInstance().writeValue(IPlugInPort.HIGHLIGHT_CONTINUITY_AREA, false);
+    
+    LOG.info("JarLoader strategy: " + JarLoader.getStrategy());
 
     LOG.info("Loading languages...");
 
@@ -143,7 +147,11 @@ public class DIYLCStarter {
 
       @Override
       public void run() {
-        FontOptimizer.run(ConfigurationManager.getInstance());
+        try {
+          FontOptimizer.run(ConfigurationManager.getInstance());
+        } catch (Exception e) {
+          LOG.error("Could not ", e);
+        }
       }
     });
     fontThread.setPriority(Thread.MIN_PRIORITY);