I am on RW 7.5 using the 'use Beta updates' option as recommended by RW in an effort to solve the issue I raised on the site.
That issue seems to be a RW issue as yours is not he only photo gallery type stack affected.
However I would be grateful if you could help out on two other issues.
1: Using Gallery 3.3.3 is it possible in regard to the image caption, to replace the automatically generated stacks image number with the file name. I have about 1600 images on this site and I would prefer not to have to manually enter the file name.
2: On one of my pages I changed the number of image columns fro 5 to 2, this works fine on pre-view but when it is published those images are still showing as 5 columns. I have supplied a link below.
PLEASE NOTE It is the top gallery 'South Window" that has been altered to 2 columns and 'West Window' to 3 columns.