Tag archive page bug with WP_Query

The bug is as follows:
on the archive.php page, when called to show category listing, everything works, but when called to show posts with a certain tag, the WP_Query stops working. I.e., i have:
$projects = new WP_Query(“post_type=post&showposts=3&cat=1&order=ASC”);

and that do not displays the posts from that category, but it displays the pages of the blog. I’ve try resetting the query and whatever else i could think, but nothing helps. Any ideas of the cause of this bug or how to be fixed ?

Thanks