Something strange happens here:
I just created a column in the file list with the invalid entry
Now, for an arbitrary set of files the column is filled with the strings
"[ SYNTAX ERROR IN FORMATTING STRING ]"
Selecting a set of files and Ctrl-T for them creates a different sequence of these 2 entries.
This can be repeated.
If I enter (the also invalid string)
I only get the error message - as exprected.
The setting for the library has no influcence.