Hello,
Just tested 6.62RC2.
The "{{" at the end is gone but there is a new or another problem.
A nzb filename with a dot in the description (maybe the space is also involved) leads to a name before the dot.
Example:
"abc. xyz - def ghi{{password}}.nzb"
Created folder name was "abc"
Instead of "abc. xyz - def ghi"
All the best,
Calahan