diff --git a/packages/manifest b/packages/manifest
index ba09562..db753cc 100644
--- a/packages/manifest
+++ b/packages/manifest
@@ -363,7 +363,7 @@
 	["yaowbgl"] = {
 		["manifestVersion"] = "1.0",
 		["package"] = "yaowbgl",
-		["version"] = "1.1.0",
+		["version"] = "1.1.1",
 		["name"] = "Yet A Other Widget Based Graphical Library",
 		["repo"] = "tree/master/yaowbgl",
 		["description"] = "New version of libgui, but using libclass2 and cleaner code and interface.",
diff --git a/packages/yaowbgl.tar b/packages/yaowbgl.tar
index cdc4a51..2886db2 100644
Binary files a/packages/yaowbgl.tar and b/packages/yaowbgl.tar differ
diff --git a/programs.cfg b/programs.cfg
index 1b76012..644d9ca 100644
--- a/programs.cfg
+++ b/programs.cfg
@@ -374,7 +374,7 @@
     dependencies = {
       ["libclass2"] = "/"
     }
-    version = "1.1.0",
+    version = "1.1.1",
     name = "Yet A Other Widget Based Graphical Library",
     description = "New version of libgui, but using libclass2 and cleaner code and interface.";
     authors = "AR2000AR",
diff --git a/yaowbgl/lib/yaowbgl/widget/Frame.lua b/yaowbgl/lib/yaowbgl/widget/Frame.lua
index 58437de..6ccac54 100644
--- a/yaowbgl/lib/yaowbgl/widget/Frame.lua
+++ b/yaowbgl/lib/yaowbgl/widget/Frame.lua
@@ -2,6 +2,24 @@ local gpu = require("component").gpu
 local Widget = require("yaowbgl.widget.Widget")
 local event = require("event")
 
+--=============================================================================
+--test bitblt bug
+local bitBltFix = false
+local testBuffer1 = gpu.allocateBuffer(2, 2)
+local testBuffer2 = gpu.allocateBuffer(2, 2)
+gpu.setActiveBuffer(testBuffer1)
+gpu.set(1, 2, 'X')
+gpu.bitblt(testBuffer2, 1, 2, 1, 1, testBuffer1, 1, 2)
+gpu.setActiveBuffer(testBuffer2)
+if (gpu.get(1, 2) == 'X') then
+    bitBltFix = false
+else
+    bitBltFix = true
+end
+gpu.setActiveBuffer(0)
+gpu.freeBuffer(testBuffer1)
+gpu.freeBuffer(testBuffer2)
+
 --=============================================================================
 
 ---@class Frame:Widget
@@ -112,7 +130,11 @@ function Frame:draw()
 
     if (newBuffer and newBuffer ~= defaultBuffer) then
         --copy the old buffer in the new buffer for transparancy effect
-        gpu.bitblt(newBuffer, self:absX(), self:absY(), self:width(), self:height(), defaultBuffer, self:absY(), self:absX())
+        if (bitBltFix) then
+            gpu.bitblt(newBuffer, self:absX(), self:absY(), self:width(), self:height(), defaultBuffer, self:absY(), self:absX())
+        else
+            gpu.bitblt(newBuffer, self:absX(), self:absY(), self:width(), self:height(), defaultBuffer, self:absX(), self:absY())
+        end
     end
 
     --clean background
@@ -141,7 +163,11 @@ function Frame:draw()
     end
     --restore buffer
     if (newBuffer and newBuffer ~= defaultBuffer) then
-        gpu.bitblt(defaultBuffer, self:absX(), self:absY(), self:width(), self:height(), newBuffer, self:absY(), self:absX())
+        if (bitBltFix) then
+            gpu.bitblt(defaultBuffer, self:absX(), self:absY(), self:width(), self:height(), newBuffer, self:absY(), self:absX())
+        else
+            gpu.bitblt(defaultBuffer, self:absX(), self:absY(), self:width(), self:height(), newBuffer, self:absX(), self:absY())
+        end
         gpu.setActiveBuffer(defaultBuffer)
         gpu.freeBuffer(newBuffer)
     end