Actually to display
$ instead of
{lamb} it uses clink . The version of clink available in current version of pentestbox is not compatible with Windows 10 .
In next version that issue will be resolved.
If you want to resolve that issue right now then follow the step given bellow.
extract it and replace the contents of PentestBox_Directory/vendor/clink with the files of extracted folder.
then restart pentestbox
That will surely solve that problem , if not please let me know.
Thanks
-Aditya