hello!
i have deactivated W3 total cache, but the error is still there.
i have found out:
every link in the album page of the gallery 2015 does not point to the right location:
http://www.hotsox-heilbronn.de/medien/bilder-2015/
contains all galleries of 2015 and the URLs pointing to them are:
http://www.hotsox-heilbronn.de/medien/bilder-2015/nggallery/bundesliga-heilbronn-10-01-15
all other galleries work fine, but notice the difference in the URL:
http://www.hotsox-heilbronn.de/medien/bilder-2014/
-> has a subdirectory more.
http://www.hotsox-heilbronn.de/medien/bilder-2014/nggallery/bilder-2014/bundesliga-in-heilbronn-09-11-2014
i cannot tell, why the behaviour is different. we added photos to galleries and galleries to albums, just as we did before 2015.
best regards,
eike