diff --git a/main/src/main/java/sbt/internal/XMainConfiguration.java b/main/src/main/java/sbt/internal/XMainConfiguration.java
index 9cebe23af..d6cf69af2 100644
--- a/main/src/main/java/sbt/internal/XMainConfiguration.java
+++ b/main/src/main/java/sbt/internal/XMainConfiguration.java
@@ -22,7 +22,8 @@ import xsbti.*;
  * we can avoid loading any classes from the old scala provider.
  */
 public class XMainConfiguration {
-  public xsbti.MainResult run(String moduleName, xsbti.AppConfiguration configuration) {
+  public xsbti.MainResult run(String moduleName, xsbti.AppConfiguration configuration)
+      throws Throwable {
     try {
       ClassLoader topLoader = configuration.provider().scalaProvider().launcher().topLoader();
       xsbti.AppConfiguration updatedConfiguration = null;
@@ -56,7 +57,7 @@ public class XMainConfiguration {
         return (xsbti.MainResult) runMethod.invoke(instance, updatedConfiguration);
       } catch (InvocationTargetException e) {
         // This propogates xsbti.FullReload to the launcher
-        throw (xsbti.FullReload) e.getCause();
+        throw e.getCause();
       }
     } catch (ReflectiveOperationException e) {
       throw new RuntimeException(e);
diff --git a/sbt b/sbt
index 7fb865514..6403c4414 100755
--- a/sbt
+++ b/sbt
@@ -46,11 +46,18 @@ realpathish () {
     COUNT=$(($COUNT + 1))
   done
 
+  TARGET_DIR="$(pwd -P)"
+  if [ "$TARGET_DIR" == "/" ]; then
+    TARGET_FILE="/$TARGET_FILE"
+  else
+    TARGET_FILE="$TARGET_DIR/$TARGET_FILE"
+  fi
+
   # make sure we grab the actual windows path, instead of cygwin's path.
   if [[ "x$FIX_CYGPATH" != "x" ]]; then
-    echo "$(cygwinpath "$(pwd -P)/$TARGET_FILE")"
+    echo "$(cygwinpath "$TARGET_FILE")"
   else
-    echo "$(pwd -P)/$TARGET_FILE"
+    echo "$TARGET_FILE"
   fi
 )
 }