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Delay in redrawing, until scrolling

Gary Griswold test
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Warning: Please note

This thread was started before GSAP 3 was released. Some information, especially the syntax, may be out of date for GSAP 3. Please see the GSAP 3 migration guide and release notes for more information about how to update the code to GSAP 3's syntax. 

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I am using TweenMax to animate the appearance and scaling of a Popup.  It works fine in one view, but in another it occasionally does not appear until after the user starts to scroll the page beneath the Popup.


The popup is just a div with three lines of text in three p elements.


The animation of the popup is done as follows:


var clickPos = String(event.detail.x) + 'px ' + String(event.detail.y) + 'px';
TweenMax.set(that.viewRoot, { scale: 0 });
TweenMax.to(that.viewRoot, 0.7, { scale: 1, transformOrigin: clickPos, immediateRender: true });
The css for the popup is as follows:
#attribution {
  position: fixed;
  width: 80%;
  top: 10%;
  margin-top: 7%;
  margin-left: 7%;
  margin-right: 7%;
  padding: 3%;
  text-align: center;
  z-index: 200;
  background-color: rgba(255, 246, 233, 0.9);
  border-radius: 25px;
  border: solid;
  border-width: thin;
  box-shadow: 4px 4px 4px #777;
  -webkit-box-shadow: 4px 4px 4px #777;
Any ideas what could cause the delay in drawing, which sometimes occurs?  When the program first starts, it will work fine, but after a while each popup does not appear unless one starts to scroll.
Thanks for any help.
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Hm, nothing is ringing a bell, no. Very difficult to troubleshoot blind - do you have a reduced test case as a codepen that we can look at? Is this happening in all browsers and OS's? Just one? The more details you can provide, the better we'll be able to help :) This smells like a browser rendering issue, possibly related to your video card (but maybe not). 

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