What is the Tech Issues Solved label?
It is the Best Answer feature enabled in all the tech areas and allows the topic starter and moderators to select which post is marked as Mark Solved, or the best answer to their support request. Some people are helped and don't bother to vote, but if you feel that your post should have been voted Best Answer, you can report the topic (first post) and then give the link to your post which moderators can then set to Mark Solved.
So in short, if you feel you answered the support request but didn't get 'marked solved' for it, report it, but please wait at least 24 hours before reporting the thread, give the OP a chance to come back and mark it for themselves.
Do not PM a moderator to have your post marked as solved, use the report button so that staff have a log of the action taken.
What is the Best Answer feature?
The amount of topics a member has solved in the Tech Areas of Neowin is shown in the post user info pane:
When a post hasn't been answered yet, the Topic starter or staff member will see a notice, bottom right of the first post in the topic, like so:
The topic starter or a staff member are the only ones who can mark the topic as solved and see that notice.
When the topic is Marked Solved, everyone sees the answer in the first post with a link to jump to it, as well as: