Same thing's happening to me.  Check out:
 
http://search.twitter.com/search.json?q=%23jimromeisburning&callback=dog<http://search.twitter.com/search.json?q=%23jimromeisburning&callback=dog>

Should look like this:
dog(
{
   
   - -
   results: [
      - -
      {
         - from_user_id_str: "257702817"
         - profile_image_url: "
         
http://a1.twimg.com/profile_images/1364757456/2011-05-22_13.20.33_normal.jpg
         "
         - created_at: "Tue, 14 Jun 2011 20:36:33 +0000"
         - from_user: "ATLienSince1987"
         - id_str: "80735397449183232"
         - -
         metadata: {
            - result_type: "recent"
         }
         - to_user_id: null
         - text: "#JimRomeIsBurning"
         - id: 80735397449183230
         - from_user_id: 257702817
         - geo: null
         - iso_language_code: "is"
         - to_user_id_str: null
         - source: "&lt;a href=&quot;http://levelupstudio.com&quot; 
         rel=&quot;nofollow&quot;&gt;Plume  &lt;/a&gt;"
      } ......
   ]
   - max_id: 80735397449183230
   - since_id: 0
   - refresh_url: "?since_id=80735397449183232&q=%23jimromeisburning"
   - results_per_page: 15
   - page: 1
   - completed_in: 0.185672
   - since_id_str: "0"
   - max_id_str: "80735397449183232"
   - query: "%23jimromeisburning"

}
)


But 3/5 times it doesn't, it looks like this:

dog( �  ݘYo�F ǿʚF݇Z��<  ��&��85b�)�  M�č�]�� 7�w��.ےl� 
҇�A�����o�3�oN%��hj���7�_�2nkY�*���r�  A�iH �� U��
 �2 ȸ�
hϛf������X� 75�w�_� ��@ \� ńt��P  �R�2 kS�I�~ 
`���I#�8i`�^+  ����Ȏ��.󻌡_0|���`�}�{���P:�$
���M�8`�E �      e  K�$Y�$N��� qs=�л��ԍ���i�� NW�E 
�ȯֲ�SU~4�<�_��Vz0Y���,txǧNw��Cg �|VU��H���~MMf�P�sۀ�N��k�V��sP4� �W����Kk�g�h 
�J ��n�L  �i+�d1��M� � O  �g�E[ʿZ� <���{�m W�g�q ���]؈ � ���9  ���֏A� ] 
v9_��͔wi�CF0 a�qHE�+
Ǧ�P#� Um!�=��Y�`�T��  K+��1�� �c< �2�  =�� t��v߆        A� $�� }�       * 
!<b›�|  �v9��h- gj( ��.܇  �2  G���4,� � 5�DcS�
�s3FF������bɄU*f>�H��O� ��4��Dd ���X &�<5ʍ�[0қN���B�|2h#.D�� ��7�� � A@s#  ��  
O��  �Ę��>@љ�@ ��g� Z��"py\ Iw)bA�q(" ; �S$E  � F/e=��"O� �%� d����G@*A ����� 
m���Թ� K�J~B'?�hTɦ�Fu[I��(;c��; � �Gpʇ�E�
dQ�IH�/ �.�p �E$ ��<�&��Q�L��< � ���*��Gb{4 �Y� �S��.�/$���۪ ���        ��υ��P 
�f��8�OP- ���>���Z͏�� `ky�'�� D��Lt���D�����I� A~ 'M�[ �Od E'5�#:sڥj��� 
����>��Dz9.Z��/��]Q�Y�~�x d3+���f{���,� JIP�M �=� % h$���圜���m���>%|���_M�  
���Q�#,�*����Osj�V\ �� 7B���C`�p��  r  odҡ���M n�Z1�        N       �p(v)�|p (
�Xd���fȵP�!�@�A �p E��hW �d<��*iP�fPY%5J��  �ٯ���џ�R����ܶj �����eW P  'ۡ� �a
�   c ��3����b�kc� �p��v i�O����� 
z����B�u��K���r��.r�����Do[����������uq��zf�ؤ��oSu�� �����T����M�  ۥ${��R u1 �� 
���>�E�H 5�-(=�7���ZA�       ���ei8*�Tvd�TY���L�� yf�t       �� = ��Z�w1�H�@� 
p�*v� ~Ru�N�ܶ �C5���!jJmVC��\��      s�ptk������[ w�^2�){.��q �}���j�wI����
�K�XնY��3m�Am,/o��7x8� �������&�p�`  @>#�ż��ʸ�/� �l����v�#�� vi�-���    `2娐 
'�aE�����Ɗ % ����� �/����m�!�� �
D x );


Stackoverflow question:
http://stackoverflow.com/questions/6348065/sencha-touch-jsonp-error

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