I've just downloaded and installed Screenshot Captor v4.00.02.  Unfortunately screenshots that I've annotated with boxes/circles are now showing a strange black line at the bottom.  See these examples:

https://dl.dropbox.com/u/53842194/sscaptor/shot1.png
https://dl.dropbox.com/u/53842194/sscaptor/shot2.png
https://dl.dropbox.com/u/53842194/sscaptor/shot3.png