Node access denied for anonymous user.

I have installed Drupal 5.0 RC1 locally and having the following problem.
Anonymous users aren't able to access node content, they see error "Access Denied" from Drupal where supposed to be node content.

Strange, this problem appeared only after I have played a bit and added 4th page. Looking to database in node_access table I saw 3 records for 3 of my (now 12) pages. And I tried to edit the page, simply go edit, then change nothing and click submit, and I see the row for this page in node_access is disappeared.

Strange. After that I did temporary solution, in node.module near the line 2650, after

  $access = module_invoke($module, 'access', $op, $node);
  if (!is_null($access)) {
    return $access;
  }

I've added

if (user_access('access content') && ($module=="node_content") && ($op=="view")) return TRUE;

But I know this solution can conflict if you set specific permission per node (btw, where can I do that?). So I want to submit this bug report, as I think this is very important issue.