Can't add twitter block to panel

I have experienced the same issue using Panels 7.x-3.3.

Some more remarks:

I didn't have this problem on my server with the testing/acceptance version of a website. After deploying the website to the production server of my client this issue arose. I then made a local deployment (Mac OS) with the exact same setup (Drupal core and contributions with the same versions) as on the production server: no issue too. This seems one issue very hard to track down...
I changed to socialmedia and widgets modules. I don't like them very much (complicated and hard to style) but alas...

Hope this is of some use.
Eric

Using #theme 'link' in renderable array causes this. A quick and ugly fix is here:

diff --git a/sites/all/modules/contrib/twitter_block/twitter_block.module b/sites/all/modules/contrib/twitter_block/twitter_block.module
index 6a7e7f8..0eb3db4 100644
--- a/sites/all/modules/contrib/twitter_block/twitter_block.module
+++ b/sites/all/modules/contrib/twitter_block/twitter_block.module
@@ -367,7 +367,7 @@ function twitter_block_block_view($delta) {
 
   $block = array();
   $block['subject'] = check_plain($config['info']);
-  $block['content'] = array(
+  $content = array(
     '#theme' => 'link',
     '#text' => 'Tweets by @twitterapi',
     '#path' => 'https://twitter.com/twitterapi',
@@ -379,7 +379,7 @@ function twitter_block_block_view($delta) {
         'data-link-color' => !empty($data['link_color']) ? '#' . $data['link_color'] : $data['link_color'],
         'width' => $data['width'],
         'height' => $data['height'],
         'data-chrome' => !empty($data['chrome']) ? implode(' ', array_keys($data['chrome'])) : $data['chrome'],
         'data-border-color' => !empty($data['border_color']) ? '#' . $data['border_color'] : $data['border_color'],
         'lang' => $data['language'],
         'data-tweet-limit' => $data['tweet_limit'],
@@ -397,5 +397,7 @@ function twitter_block_block_view($delta) {
     ),
   );
 
+  $block['content'] = drupal_render($content);
+
   return $block;
 }
:

Are you using the latest -dev release of ctools?

I believe this was fixed with #1925018: Adding a renderable-array block to a page gives errors in the admin UI - http://drupalcode.org/project/ctools.git/commit/280ccd0.

Just tested and confirmed that this is fixed in the latest -dev of ctools.

I'm experiencing the same problem. I'm running Ctools 7x - 1.3 . Does anyone know when ctools will update their versions so that this fix is also in the official version?

This patch fixes the problem and now Twitter block can be placed in panels.

This was fixed in CTools 7.x-1.4.

If you are still experiencing this issue with the latest release of CTools, please file a new issue.