overwriting other image if saving a new picture at the same time in same folder

Binary package hint: gthumb

in: Ubuntu 9.10
gthumb: 3:2.10.11-1ubuntu1

While I was processing an image (cut/crop and tried to save) I was scanning (with xsane 0.996) in parallel images which were saved in the same folder.
Obviously I somehow saved my work in another filename! Means: Afterwards I got the same image in 2 files, and lost 1 scan.
I was hard for me to reproduce, but I expierenced it several times.
It is lke this: while being in the window for cutting, another image was loaded in the background. So at the point when i wanted to save my change, it was somehow processed to another image.
In general one can say: gthumb reacts very sensitive when adding files/pictures to the folder you are currently working in. (For me it seems like it is handling the files in some kind of internal cache/list/whatever which screws up if addidng files?)
(e.g. if I am in a diashow and adding a picture, gthumb stops the diashow)

ProblemType: Bug
Architecture: i386
Date: Mon Jul 12 21:57:03 2010
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/gthumb
NonfreeKernelModules: nvidia
Package: gthumb 3:2.10.11-1ubuntu1
ProcEnviron:
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-22.60-generic
SourcePackage: gthumb
Uname: Linux 2.6.31-22-generic i686