diff --git a/cocoa/main.m b/cocoa/main.m
index 2893e5b..91cd804 100644
--- a/cocoa/main.m
+++ b/cocoa/main.m
@@ -24,9 +24,17 @@ int main(int argc, char *argv[])
     Py_SetPythonHome(wPythonPath);
     Py_Initialize();
     PyGILState_STATE gilState = PyGILState_Ensure();
-    FILE* fp = fopen([mainpy UTF8String], "r");
-    PyRun_SimpleFile(fp, [mainpy UTF8String]);
-    fclose(fp);
+    /* This main gets called when multiprocessing spawns new threads.  To
+       prevent this from opening more windows and not working correctly we
+       are just checking main here and not running the file.  Should be able
+       to block on the python side of things but checking
+       __name__ == "__main__" did not seem to work in the one location I tried.
+     */
+    if ([NSThread isMainThread]) {
+        FILE* fp = fopen([mainpy UTF8String], "r");
+        PyRun_SimpleFile(fp, [mainpy UTF8String]);
+        fclose(fp);
+    }
     PyGILState_Release(gilState);
     if (gilState == PyGILState_LOCKED) {
         PyThreadState_Swap(NULL);
diff --git a/dupeGuru.xcodeproj/project.pbxproj b/dupeGuru.xcodeproj/project.pbxproj
index 92ca63a..f09961f 100644
--- a/dupeGuru.xcodeproj/project.pbxproj
+++ b/dupeGuru.xcodeproj/project.pbxproj
@@ -1348,7 +1348,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				MACOSX_DEPLOYMENT_TARGET = 11.1;
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = macosx;
@@ -1399,7 +1399,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				MACOSX_DEPLOYMENT_TARGET = 11.1;
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = macosx;
 			};
@@ -1418,7 +1418,7 @@
 					"$(inherited)",
 					"$(PROJECT_DIR)/build",
 				);
-				MACOSX_DEPLOYMENT_TARGET = 11.1;
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.hardcoded-software.dupeguru";
 				PRODUCT_NAME = dupeGuru;
 			};
@@ -1437,7 +1437,7 @@
 					"$(inherited)",
 					"$(PROJECT_DIR)/build",
 				);
-				MACOSX_DEPLOYMENT_TARGET = 11.1;
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.hardcoded-software.dupeguru";
 				PRODUCT_NAME = dupeGuru;
 			};