Of course with a new database no problem.
After optimization of my actual one that specific problem disappear.
But I Notice
Before optimazation
Thumb.db : 65896 Mo
Xnviewdb : 354712 Mo
After optimization (all options checked)
Thumb.db : 65896 Mo
Xnviewdb : 354712 Mo
???? It was specified 200 Mo for maxi size of thumb and 50 for the other DB (I thought thumb were the most voluminous!)
These last weeks I worked mainly on IPTC/XMP, tagging precisely - alternately one and several- JPEG files. (# 1000 in order to have picture's informations displayed -like taxonomy- in some slide-show)
I have some problems with database perhaps after program's crashes (with label rating and label disappearing*) (and also some more ".bak" I told you, a bit annoying to delete but not too much important)
But not all problems are Xnview's fault !
In contrast with database, when I have problems with IPTC/XMP in files, it's only my fault : forgetting checking box or making some mistake (It would be much better if always visible in the options box -like Xn Win- as someone and I ask it).
That's the reason I suggested some improvement for batch tagging to facilitate corrections http://newsgroup.xnview.com/viewtopic.php?f=60&t=28791
* I am sorry but can't identify always a common point before problem (also because sometimes I notice it afterwards).
An other one, I just have this evening after copying a directory on a laptop where Xnview is fresh installed: rating is not displayed on the thumb see below

I, close,open, refresh, optimize db, rebuild thumb .. nothing!
What did I missed ?
Thanks for help
Kind regards
Gérard