Hi,
Though I'm not able to drag a Layer into the default Painter X Image Portfolio (like several others who have the same problem), I am able to capture a Pattern and save it to the default Painter X Patterns library.
The tutorial below is not specifically for Patterns libraries, but you might be able to apply the principles to your situation.
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A few people in the Corel Painter X newsgroup and in one of the Corel Painter the Official Magazine forums have been talking about a problem dragging image Layers into the Image Portfolio to save the Layers.
The person who asked about this in the Corel Painter Magazine forum happens to also be the person who found the solution.
Since she didn't elaborate and a lot of new users might not understand how to work the solution, I whipped up a tutorial this afternoon and posted it in one of the Corel Painter Magazine forums.
Though I wrote it for people having this problem in Painter X, the tutorial works in earlier versions as well.
If you're not using Painter X, you probably won't have the problem but the tutorial includes instructions for creating a new custom Image Portfolio. That you might want to do one day if you don't already save Layers there for future use.
Maybe a few people here will find it useful, too.
Corel Painter the Official Magazine
Forum Name: Hot tips/ A problem shared
Thread Name: Adding images to image portfolio....
Cheers!