[Plugin: Taxonomy Images II] Plugin template could not be found

I think part of my problem is WP_PLUGIN_DIR in a Windows development environment can contain backslashes, while __FILE__ does not.

This code is in class-Plugin.php

elseif ( stripos( __FILE__, WP_PLUGIN_DIR ) !== false ) {
			// This is a plugin
			$this->folder = rtrim( basename( dirname( __FILE__ ) ), '/' );
			$this->type = 'plugin';
			$this->dir = trailingslashit( WP_PLUGIN_DIR ) . $this->folder;
			$this->url = plugins_url( $this->folder );
		} else {
			// WTF?
			error_log( 'PLUGIN/THEME ERROR: Cannot find ' . WP_PLUGIN_DIR . ' or "themes" in ' . __FILE__ );
		}

In my local install stripos(__FILE__, WP_PLUGIN_DIR) will ALWAYS be false (even in wp-admin because the slashes in those two paths don’t match.

Not sure if this affects my front end issue, but I couldn’t manage the plugin in Admin because of this.

Same for me.
Would be nice to have it fixed.