warning: implode() Bad arguments. in project_issue.views.inc

The only way I can see this error message coming about is if you had no statuses defined at /admin/project/project-issue-status or if you modified your db so that none of the statuses were included in the default query.

Are either of these the case on your site?

Line 148 in project_issue.views.inc is the line in HEAD that is causing problems for you, I believe. I suspect that you have not updated your code since a fairly recent one line commit to the module was made. Here is that line:

'#options' => array('defaults' => implode(',', project_issue_state(0, false, false, 0, true))) + project_issue_state(),

Since your error message says that implode has bad arguments, that must mean that the return value ofproject_issue_state(0, false, false, 0, true) is NULL, because that is the only way I was able to get implode to give me the same error you reported.

Here is the code of project_issue_state():

function project_issue_state($sid = 0, $restrict = false, $is_author = false, $current_sid = 0, $defaults = false, $account = NULL) {
  static $options;

  if (!$options) {
    $result = db_query('SELECT * FROM {project_issue_state} ORDER BY weight');
    while ($state = db_fetch_object($result)) {
      $options[] = $state;
    }
  }

  foreach($options as $state) {
    if ($restrict) {
      // Check if user has access,
      // or if status is default status and therefore available to all,
      // or if user is original issue author and author has access,
      // or if the issue is already in a state, even if the user doesn't have
      //   access to that state themselves.
      if (user_access('set issue status '. str_replace("'", "", $state->name), $account)
          || user_access('administer projects', $account)
          || ($state->sid == variable_get('project_issue_default_state', 1))
          || ($state->author_has && $is_author)
          || ($state->sid == $current_sid) ) {
        $states[$state->sid] = $state->name;
      }
    }
    else if ($defaults) {
      if ($state->default_query) {
        $states[$state->sid] = $state->name;
      }
    }
    else {
      $states[$state->sid] = $state->name;
    }
  }

  return $sid ? $states[$sid] : $states;
}

In this particular invocation of the function, the $defaults parameter is TRUE, so the code that gets executed within the foreach block is this:

    else if ($defaults) {
      if ($state->default_query) {
        $states[$state->sid] = $state->name;
      }
    }

The return value of the function is this:

return $sid ? $states[$sid] : $states;

Because the $sid parameter to the function is 0, $states will always be the return value. The only way I see that $states could be NULL is if you have either no statuses, so nothing within the foreach loop gets executed, or you have no states that are in the default query, in which case $states won't be populated, and since it's not initialized earlier in the function it will be NULL.

Am I missing something obvious here? Can you make sure that the line you're getting the error on is the same line I pasted at the top of this comment? Also, maybe you can debug a bit in project_issue_state() and see if you can figure out what is going on.

Ideally, we would initialize $state to be array() at the top of the function, and for the D6 version we will have to to prevent notices, but I don't see how this would actually matter if your states are as you tell me they are.