"Customize thumbnail" output dimensions

Hi,

I have set thumbnail dimensions to 180×120 px with “Set fix dimension” option selected on Thumbnail settings page. New uploaded pictures are added with thumbnails of this size and “regenerate thumbnails” feature works as expected.

But, I have an issue when using Edit Thumb action on Manage Gallery page. In Customize Thumbnail dialog, I select an area I want to be a thumbnail and press the Update button. Image thumbnail updates, as expected.

Thing is, thumbnails customized this way do not always have size 180×120 px I set in options. I found 180×119 or 180×118 thumbnails.

I would not notice this unless my post with a gallery shows up with corrupted layout. I think it is related to different thumbnails dimension.

Workaround I found so far is to use Edit Thumb action to select a different area until I get 180×120 thumbnail – very annoying indeed.

Did someone observe this behaviour? How to fix?

(Original picture is about 1770×1200 and I select a relatively small area for thumbnail. Maybe a dimension ratio problem when selecting area for thumbnail?)

Thanks.

http://wordpress.org/extend/plugins/nextgen-gallery/