Pathfinder > remove front distorts object

[ericm10089679]

I am having an issue when I use the minus front pathfinder tool, it's distorting an object.  I am making an outlined font transparent over a background fill and each time I use Pathfinder > Exclude Front it doesn't remove all the U. At the top of what used to be the letter it becomes angled. 

[Kurt Gold · Accepted solution]

It may be a GPU Preview issue.

In the View menu, try CPU Preview instead.

[ericm10089679]

Thanks!  If I understand GPU and CPU, it's the way the computer reads the file - utilizing the graphics card or not, correct?  I would have never thought to change that setting.