Thread:Extension talk:WYSIWYG/Unable to browse Local Images/reply (7)

Aha, figured it out. It was due to the install instructions provided next to the download-table were omitting a step I needed, which I found on the install-page's 'discussion' page.

define('SMW_HALO_VERSION',true);

Once I added the suggested line into my 'LocalSettings.php' file, the issues I observed before have gone now, yay :)