gthumb on FC6 not seeing jpeg files

[Tom Freeman]

I'm baffled on how to trouble shoot this one. I have a machine running  
FC6 with the 2.6.18-1.2798 kernel and gthumb-2.7.8-3. When called from  
the command line as a viewer, gthumb will happily display my jpeg  
files. However, used as a browser like I usually use gthumb, no jpeg  
files are found, although gif files are. I'm not finding any error  
messages either in the log files, nor when running gthumb from the  
command line. Turning selinux on or off doesn't seem to matter.  
Nautilus does see the files.

Any ideas on what is going on here? I've got a new granddaughter who  
lives out of state, so pictures are the only contact at the moment.

Thanks in advance