Hi I posted a similar bug on jquery menu but I wanted alter you to this one too.
I updated to the latest version of devel today and found a warning for the module.

notice: Undefined variable: block in advancedbookblocks_block() (line 422 of /vpfa-dev/hr_drupal6_template/sites/all/modules/advancedbookblocks/advancedbookblocks.module). =>

I asked about it in devel issues and found out that

"notice: Undefined variable" used to be ignored, but it's good practice to always give your variables a value before referencing them; these notices often point to bugs, and that's why we're not suppressing them anymore.

ref: http://drupal.org/node/1000490#comment-3837610

Thanks

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PixelClever’s picture

PixelClever CreditAttribution: PixelClever commented
_vid’s picture

_vid CreditAttribution: _vid commented

Hi Aaron,

I'll try to figure out how to post a legitimate patch, but in the interim here's a contribution toward a patch that declares $block in advancedbookblocks_block().

--- //advancedbookblocks/advancedbookblocks.module	Mon Dec 20 13:17:16 2010
+++ //advancedbookblocks/advancedbookblocks_patch_test.module	Mon Dec 20 13:21:18 2010
@@ -384,6 +384,7 @@
  */
  
 function advancedbookblocks_block($op = 'list', $delta = 0, $edit = array()) {
+  $block = array();
   $result = db_query("SELECT delta FROM {adv_book_block}");
   while ($book = db_fetch_object($result)) {
     $delta_array[] = $book->delta;