Photos problems

[Willem Ferguson]

I have some photos that are not displayed in Subsurface. The path and 
filename in the xml divelog are correct, but the hash property is empty. 
I deleted one of these problematic photos, re-imported it into the dive 
and saved the xml. The newly-loaded photo still has no hash and is still 
not displayed by Subsurface. For the other photos that not displayed the 
hash property is also empty (in other words, in the XML hash = "").

Any suggestions?

Kind regards,

willem