I am unable to get a decent stitch of these images with 2.5.0 A1 regardless of style of detection I use.
If I use Similarity then stitch is poor and I am unable to resolve the problems using the CP editor, if I fix one link then optimising removes an existing link and so on.
If I use Full 3D the result is even worse and the zenith image gets omitted altogether.
Image set from here:http://www.chem.ox.ac.uk/oxfordtour/tutorial/index.asp?ID=35&pagename=Canon%205D%20&%2015mm%20FE
Download the images - shot with Canon 5D and Canon 15mm FE:http://www.chem.ox.ac.uk/oxfordtour/canon5dworkflow/jpgs.zip
I am attempting to stitch after removing the two nadir images.
APG 2.0.9 has no problems at all achieving an excellent stitch.
First screenshot - APG 2.5.0 A1 using Ransac model - similarity.
Second screenshot - APG 2.5.0 A1 using Ransac model - Full3D.
Third screenshot - APG 2.0.9.