Error when creating new term

Whenever I chose "create new term", the form is disabled (cannot click preview, submit). And the site creates the following three log entries. -- Always these three together.
(This is a great module. It is exactly what I wanted. Please help me to make it work.)

Error log #1:
Location: http://localhost/mysite/hierarchical_select_json
Message: Missing argument 2 for drupal_retrieve_form() in C:\apache2triad\htdocs\mysite\includes\form.inc on line 320.

Error log #2:
Location: http://localhost/mysite/hierarchical_select_json
Message: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, '' was given in C:\apache2triad\htdocs\mysite\includes\form.inc on line 366.

Log #3:
Location: http://localhost/mysite/hierarchical_select_json
Message: uasort() [function.uasort]: The argument should be an array in C:\apache2triad\htdocs\ mysite\includes\common.inc on line 2832.

Same problem, current dev version of HS.

What's strange is that it is context dependent. I'm using the Content Profile module, which means that I can edit profile content either via
1. My Account -> Profile -> Edit
-- or --
2. Create Content -> Profile

Using method 1, I get no errors and it runs normally. Using method 2, I have the issue as samwarren desribes it.

Okay, some more details. Running it with Firebug on, it reports

1. jquery.js on line 13 (which is the whole jsquery javascript)

Request Headers:
X-Requested-With: XMLHttpRequest
Referer: http://example.com/node/10/edit?destination=admin%2Fcontent%2Fnode

Post:
field_disciplines[tids][hierarchical_select][selects][0] - label_0
field_favorites[tids][dropbox][hidden][lineages_selections][0] - a:1:{i:0;s:3:"132";}
field_favorites[tids][hierarchical_select][selects][0] - 70

Response:

Fatal error: Unsupported operand types in /home//public_html//includes
/common.inc on line 2834

2. Then in /hierarchical_select/hierarchical_select.js I get

Drupal.HierarchicalSelect.state[hsid].log is undefined
throwError()()hierarch...lect.js?y (line 183)
error()()hierarch...lect.js?y (line 499)
(?)()()jquery.j...e3Q%3D%3D (line 1)
(?)()()jquery.j...e3Q%3D%3D (line 1)
[Break on this error] Drupal.HierarchicalSelect.state[hsid].log.push([ message ]);

I'm thinking this might have to do with hierarchical_select_get_form_item returning FALSE under certain conditions, which is not an array, so when that gets passed to drupal_render and it hits the line where I'm getting the fatal error it encounters this on common.inc line 2834:

  $elements += array('#title' => NULL, '#description' => NULL);

So it's trying to do an array union on a boolean, which will cause a fatal error in PHP. But when I add a line between hierarchical_select.module between lines 303 and 304 to make sure it gets passed an array, the fatal error goes away, but the select no longer works either (that is, I select, but the list of child terms doesn't expand out).

So I'm pretty sure HS is sending a scalar when it needs to send an array and that is causing the error.

Now I'm getting somewhere - POST data says

hsid 0

So $_POST['hsid'] is undefined - that explains things a bit more. Now just have to figure out why. Other POST data expected by that function are okay

form_build_id form-adf5708c1e5d25acdaeb64c040763f31
form_id profile_node_form
form_token db10f6de9721c8ad7f71f180101a1315
hs_form_build_id hs_form_61a9131fd92adfde3c93226d46c0acaa
hsid 0

(This is Firebug console POST data)

When I use the web developer toolbar to look at the generated source code, there is a hidden field for hs_form_build_id, but I don't see hsid defined anywhere

Okay, compared the generated code from pages that work and ones that don't - no major differences. Put it on a testbed and disabled all modules with a lot of Javascript and then started re-enabling, cleared cache between every page load.

CTools: Okay
WYSIWYG: Okay
Taxonomy Manager: Okay
JQuery Menu: Okay
Advanced Taxonomy Block: Okay
Image Assist: Okay
Panels: Okay
Delegator (for Panels3): FAIL!

So a bit more searching suggests that this is
1. Duplicate HS issue of http://drupal.org/node/368471

2. Duplicate of Delegator issue http://drupal.org/node/370487

3. All of which are probably related to the Delegator Node Edit override issue, which is marked as fixed, but probably isn't: http://drupal.org/node/367213

I'm not sure at this point whether to lay all this on Delegator and to close all HS bugs, or what.

I have the exact same issue as stated in comment #2.

I enabled Content Profile at registration and if I access the hierarchical select taxonomy for anonymous users via:
User Registration (with the embedded Profile from "Content Profile")
I receive "Invalid response from server"

If I access the hierarchical select for anonymous users via:
Create Content -> Profile
hierarchical select works fine.

In my case I disabled all other modules and therefore tracked down this issue with "Content Profile" module.
Any idea?

Just for information i have the exact same issue as stated in comment #1 and after disable the memcache admin module, all rework .