Hi @flowbob
Becuase your WP_Query uses a literal string 'tag=$tagstr', the variable will not be converted.
If you wish to use the parameter in this manor, just cahnge to double quotes like so:
"tag=$tagstr"
You can also wrap variables like so:
"tag={$tagstr}"
Your best bet is to always use an array instead of a string. Also make sure you use the post_type param.
Thanks
E
