# Masking behaving strangely

**URL:** https://forum.kirupa.com/t/masking-behaving-strangely/284807
**Category:** flash
**Created:** [March 23, 2009, 9:21pm UTC](https://forum.kirupa.com/t/masking-behaving-strangely/284807 "2009-03-23T21:21:54Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![bortiquai](https://avatars.discourse-cdn.com/v4/letter/b/c5a1d2/32.png) [@bortiquai](https://forum.kirupa.com/u/bortiquai)
#### Post date: [March 23, 2009, 9:21pm UTC](https://forum.kirupa.com/t/masking-behaving-strangely/284807/1 "2009-03-23T21:21:54Z")

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I have a movie clip that uses masking. I designed this movie clip by itself for testing and such, and got it working well.

After that, i implemented it into my project, using the same code, etc… creating a new Moive Clip within my main project to put this new MC.

The problem I am having, is with the masking. At first it loads fine, but i use a tween to scroll the object being maked. When I do, that, it does not display correctly. The color changes, and pictures and sprites that I have loaded disappear. If I remove the mask, the whole thing works perfectly, except that you can see all of the things that should be masked (obviously).

How come when I am adding the mask, it screws it up?

Thanks.