query_posts and paging

I’ve seen several threads which appear to address this topic, yet don’t seem to apply to my situation.

Briefly: I have a page that displays all posts from a given category (in this case Announcements). I thought I had it done by simply creating a custom “announcements.php” page template containing a
query_posts("cat=1"); right before The Loop, and then assigning my “Announcements” page to it.

All seemed well until I tried the “Next Page” link and then I just got a blank page. The URI of the initial page with posts on it is:

https://www.mysite.com/wp/?page_id=55

and when I click the “Next page” link I get:

https://www.mysite.com/wp/?page_id=55&paged=2

and all should be good, but I get a blank page instead.

Any ideas out there?