When browsing to open a new image either from the 'File...' menu or from a control component allowing for another source, it will sometimes mistake a single-click as a double click. It doesn't appear to have any pattern, and is persistent through program restarting.
For example I will click on an image once, and by OS default, it should simply select it, and about 2/3 of the time it will, but any other time and it will think I double-clicked on a file and opens it.
Roses are #FF0000
Violets are #0000FF
All my base are belong to you.