ASTK has problem with directories

hello,
when doing within ASTK "file - open" or "file - save as" and then clicking to a certain directory (in this case: /home/caelinux/) I get the following message from ASTK:

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Informations
<INFO> warning : Shift detected in the treatment of this directory. Usually that means that a file name contains a space, the file or directory '501' may be badly represented in the list.

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In fact, certain directories I don't find to click onto them or to open an .ASTK file contained in them. But I have no spaces in any file names. I can't find any rule to determine the "hidden directories". What can I do?

Thank You very much for Your help, Johannes

These are the file names within my /home/caelinux/: For example 08_acopo_Q1 is not found

000000-1368-956 01-001 asm.stp*
07_CA_course_nonlin/
07_Loe_Q3/
08_acopo_Q1/
caelinux_localhost_2810_SALOME_pidict
caelinux_localhost_2811_SALOME_pidict
CAElinux_symetrie_cyclique.zip*
CAELINUX_thermomecanique.rar*
contact.tar.gz*
Desktop/
Documents/
Eficas_install/
flasheur/
Johannes.tgz*
list.txt
mooney-rivlin-V604189a.zip*
Movies/
Music/
OpenFOAM@
o-ring.tar.gz*
Pictures/
proix.txt*
R/
recalage/
Seg6_compare-linear-with-nonlinear.tar.gz*
Seg_Proix_6.tgz*
Tardieu_grand-defor_test_NL.comm*
tmp@
ToDo.txt
Tut_4_lin-el_contact.tar.gz*
wuerfel_balken_2_ergeb.unv*
wuerfel_balken_2.msup*
wuerfel_balken_2.unv*