TweenSize affects transparency of a GuiObject


Hi. Today I have experienced a strange bug.

When I’m using a TweenSize function for my Gui - the transparent GuiObjects are becoming less transparent, while in reality - I don’t have any function to change background transparency.

The glitch happens under few circumstances:

  • The main GuiObject needs at least one child GuiObject inside
  • The main GuiObject’s Anchor point might be affecting this. For example x = 0 won’t work.
  • Same might go for position sometimes.
  • When I’m playing a game, it will always trigger.
  • In studio, it’s a bit different story. It only works on some resolutions. Example AbsoluteSize is 758, 435.

To reset transparency to older state, resize window or remove/add a GuiObject inside.
The transparency value doesn’t seem to change itself.

Here’s an example Gui TweenSize_Bug.rbxm (2.1 KB).


AMD A8-6600K APU with Radeon™ HD Graphics

Video Card
NVIDIA GeForce GTX 950

8.0 GB

Operating System
Microsoft Windows 7 Home Premium Edition Service Pack 1 (build 7601), 64-bit

Bug started to happen lately, I just noticed it today. Not earlier.

If I had to fix it, I would see what modifies the transparency - what affect it’s behavior.
It only happens when the width goes 0.


Added a small detail about transparency value.


we are looking into this, thanks for the report!


Was able to find the underlying cause of this, and have a fix in the works. This fix should either ship in a bit over a week or two.