Panels Simple Cache undefined index notices.

The use_pager bug can be fixed using:

diff --git a/plugins/cache/simple.inc b/plugins/cache/simple.inc
index 916df42..980d834 100644
--- a/plugins/cache/simple.inc
+++ b/plugins/cache/simple.inc
@@ -104,7 +104,7 @@ function panels_simple_cache_get_id($conf, $display, $args, $contexts, $pane) {
     $id .= ':' . $language->language;
   }

-  if($pane->configuration['use_pager'] == 1) {
+  if(isset($pane->configuraton['use_pager']) && ($pane->configuration['use_pager'] == 1)) {
     $id .= ':p' . check_plain($_GET['page']);
   }

As for the token issue, I simply removed the following from includes/plugin.inc and (a) the error went away and (b) My pane reappeared.

    // And for tokens:
    $tokens = ctools_set_page_token();
    foreach ($this->tokens as $token => $argument) {
      if (isset($tokens[$token])) {
        unset($tokens);
      }
    }

    $this->tokens = $tokens;

I'm not entirely sure what this code is trying to achieve. Should it be merging rather than un-setting?

EDIT: To clarify - this is on line 208 of includes/plugin.inc (at the end of function cache()).

Hmm actually the issue appears to be more related to if you cache an entire panel AND a pane...

In my case I have a panel and I add the Page Title pane. I then enable a Simple Cache on both the pane and the panel. On the first load, the Page Title pane appears correctly, but on the following load I get the text "Array" instead. However, if I only enable the Simple Cache on the PANE (not the whole PANEL), then there is no error..

I have found that changing the above token snippet simply to:

 $this->tokens += ctools_set_page_token();

That merges any page-specific tokens into the array to be cached... Although it is a bit of a "brute force" approach.