Sensitivity to the incoming type of $parent (int vs string) for taxonomy_get_tree() causes content_taxonomy to break when the taxonomy wrapper is enabled. Not sure if I should file a bug against content_taxonomy also, but it makes sense to fix it in category's wrapper also so that it will be more robust against future bugs.

Patch:

RCS file: /cvs/drupal/contributions/modules/category/wrappers/taxonomy.module.copyme,v
retrieving revision 1.26.2.4
diff -u -r1.26.2.4 taxonomy.module.copyme
--- taxonomy.module.copyme      7 Apr 2007 20:22:14 -0000       1.26.2.4
+++ taxonomy.module.copyme      1 May 2007 01:11:55 -0000
@@ -716,7 +723,7 @@
  *   to have "depth" and "parents" attributes in addition to its normal ones.
  */
 function taxonomy_get_tree($vid, $parent = 0, $depth = -1, $max_depth = NULL) {
-  if ($parent === 0) {
+  if ($parent === 0 || $parent === '0') {
     $parent = NULL;
   }
   elseif ($parent === NULL) {