5.12 - Rebuild medium creates full size image(NOT A BUG)
On my install of 5.12 medium images are correctly created when uploading new images. When running rebuild mediums the medium generated is the same as the full image, but is displayed by show photo with the medium width and height tags.
Attachment one is screen grab just after uploading image.
Attachment two is screen grab immediately after running resize mediums.
Note the file sizes. Full size image is being squeezed into medium display area.