In your post, I see concat not Open. Is that what you see?
"So when I open the reader, do File -> Open {or click on the folder icon} and then select the Details view (the drop down list in the last icon on the top right) then click on the Modified column heading twice to sort the files by modified date."
If the { is replaced with (, then "Open {" becomes "concat(". It seems to have something to do with the word open and the opening parenthesis.
I'm running Win2k + SP4, all recent MS updates, Mozilla 1.3 Gecko/20030312. Closing Mozilla didn't change the behavior, nor did rebooting.
Oh well.
Cheers,
Scott.