Hi Juan,
I have to report a bug with this version 1.8.7:
Windows 10/64 Dell Latitude E6540 with 2 monitors.
I made a mosaic of NGC7000 6x5
the script MosaicByCoordinates with this version does not work, it reports "TypeError: resWindow is null" for all images.
I reinstalled the old version 1.8.6.1473 and now the script MosaicByCoordinates with the same files works perfectly again.
Another problem but also with 1.8.6.1473 is that the mouse icon moves slowly when it is over an image , it seems like a break. 2-3 versions before the movement was just normal using the same system. Well this is a very little problem, anyway.
Armando