diff --git a/__init__.py b/__init__.py
index eddc933..92104a1 100644
--- a/__init__.py
+++ b/__init__.py
@@ -1447,14 +1447,10 @@ def register():
 
 
 def unregister():
-	#GUI Utilities
-	# utilities_ui.unregister()
-	
 	from bpy.utils import unregister_class
 	for cls in reversed(classes):
 		unregister_class(cls)
 
-
 	#Unregister Settings
 	del bpy.types.Scene.texToolsSettings
 
@@ -1463,6 +1459,9 @@ def unregister():
 		km.keymap_items.remove(kmi)
 	keymaps.clear()
 
+	#GUI Utilities
+	utilities_ui.unregister()
+
 	bpy.types.IMAGE_MT_uvs.remove(menu_IMAGE_uvs)
 	bpy.types.IMAGE_MT_select.remove(menu_IMAGE_select)
 	bpy.types.IMAGE_MT_image.remove(menu_IMAGE_MT_image)
diff --git a/op_island_align_edge.py b/op_island_align_edge.py
index 13eeadc..b15eee7 100644
--- a/op_island_align_edge.py
+++ b/op_island_align_edge.py
@@ -126,17 +126,15 @@ def align_island(uv_vert0, uv_vert1, faces):
 			loop[uv_layers].select = True
 
 	diff = uv_vert1 - uv_vert0
-	angle = math.atan2(diff.y, diff.x)%(math.pi/2)
+	current_angle = math.atan2(diff.y, diff.x)
+	angle_to_rotate = round(current_angle / (math.pi/2)) * (math.pi/2) - current_angle
 
 	bpy.ops.uv.select_linked()
 
 	bpy.context.tool_settings.transform_pivot_point = 'CURSOR'
 	bpy.ops.uv.cursor_set(location=uv_vert0 + diff/2)
 
-	if angle >= (math.pi/4):
-		angle = angle - (math.pi/2)
-
-	bpy.ops.transform.rotate(value=angle, orient_axis='Z', constraint_axis=(False, False, False), orient_type='GLOBAL', mirror=False, use_proportional_edit=False)
+	bpy.ops.transform.rotate(value=angle_to_rotate, orient_axis='Z', constraint_axis=(False, False, False), orient_type='GLOBAL', mirror=False, use_proportional_edit=False)
 
 
 bpy.utils.register_class(op)
diff --git a/op_rectify.py b/op_rectify.py
index e5fc90a..d1b3348 100644
--- a/op_rectify.py
+++ b/op_rectify.py
@@ -4,6 +4,7 @@ import operator
 from mathutils import Vector
 from collections import defaultdict
 from math import pi
+import sys
 import time
 from math import radians, hypot
 
@@ -38,7 +39,11 @@ class op(bpy.types.Operator):
 		rectify(self, context)
 		return {'FINISHED'}
 
-
+def time_clock():
+        if sys.version_info >= (3, 3):
+                return time.process_time()
+        else:
+                return time.clock()
 
 precision = 3
 
@@ -61,7 +66,7 @@ def rectify(self, context):
 
 def main(square = False, snapToClosest = False):
 
-	startTime = time.clock()
+	startTime = time_clock()
 	obj = bpy.context.active_object
 	me = obj.data
 	bm = bmesh.from_edit_mesh(me)
@@ -310,7 +315,7 @@ def SuccessFinished(me, startTime):
 	#use for backtrack of steps 
 	#bpy.ops.ed.undo_push()
 	bmesh.update_edit_mesh(me)
-	#elapsed = round(time.clock()-startTime, 2)
+	#elapsed = round(time_clock()-startTime, 2)
 	#if (elapsed >= 0.05): operator.report({'INFO'}, "UvSquares finished, elapsed:", elapsed, "s.")
 	return
 
@@ -634,4 +639,4 @@ def hypotVert(v1, v2):
     hyp = hypot(v1.x - v2.x, v1.y - v2.y)
     return hyp
 
-bpy.utils.register_class(op)
\ No newline at end of file
+bpy.utils.register_class(op)
diff --git a/utilities_ui.py b/utilities_ui.py
index 087abae..02e2f37 100644
--- a/utilities_ui.py
+++ b/utilities_ui.py
@@ -155,12 +155,13 @@ def unregister():
 	from bpy.types import WindowManager
 	for preview_collection in preview_collections.values():
 		bpy.utils.previews.remove(preview_collection)
-	preview_collections.clear()
+		preview_collection.clear()
 	
 
 	# Unregister icons
 	# global preview_icons
-	bpy.utils.previews.remove(preview_icons)
+	# bpy.utils.previews.remove(preview_icons)
+	preview_icons.clear()
 
 
 	del bpy.types.Scene.TT_bake_mode