Colorbox breaks Views Accordion block display and other js wrappers

My issue:
Enabling Colorbox, some js wrapping break (disabling, site works as expected):

• editing a view, the displays (page, block, table, etc.) show one under the other (i.e. vertical tabs do not shift between displays but each tab has an anchor that scroll to the related display box);
• in the module page, rendered with "module filter" (which also enables verical tabs), dynamic filtering is broken;
• a views block display, created with Views Accordion style, lose the wrapping (i.e. css wrapping class is not applied), so there is no accordion and all posts are all listed in plain text (with some css formatting).

I'm using image module and image attach to attach images to nodes through create/edit node.
Images are not triggered by colorbox. Their link point to the image node, as expected without modules that handle image overlay (lightbox, colorbox, etc).

Viewing drupal modules page, Firebug console throws me these two errors (1):

missing ) in parenthetical 
...h[i]=0),k in h&&(h[k]="true"),h.name=f++(new Date),K.fastIframe?l():a(h).one("lo...

Where the console point the arrow to the first parenthesis (here in bold): ++(new Date)

And (2):

jQuery is not defined
modules()modules (line 17)

...ree_videos": true, "slideshow_interval": 5000, "slideshow_automatic_start": true...

I got the first error in other pages, too.
I tried firebug on a random page on my site. Hovering on the error in the console I get that script (I trim it):

<!--//--><![CDATA[//><!--
jQuery.extend(Drupal.settings, { "basePath": "/cms/", "colorbox": { "transition": "elastic", "speed": 350, "opacity": "0.85", "slideshow": false, "slideshowAuto": false, "slideshowSpeed": 2500, "slideshowStart": "", "slideshowStop": "", "current": "{current} of {total}", "previous": "« Prev", "next": "Next »", "close": "Close", "overlayClose": true, "maxWidth": "100%", "maxHeight": "100%", "image_derivative": "_original" }, "googleanalytics": { "trackOutgoing": 1, "trackMailto": 1, "trackDownload": 1, "trackDownloadExtensions": 

[more js code here]

 "viewsSlideshowSingleFrame": { "#views_slideshow_singleframe_main_slideshow_paper-block_1": { "num_divs": 7, "id_prefix": "#views_slideshow_singleframe_main_", "div_prefix": "#views_slideshow_singleframe_div_", "vss_id": "slideshow_paper-block_1", "timeout": "5000", "sort": 1, "effect": "fade", "speed": "1000", "start_paused": 0, "delay": "0", "fixed_height": "1", "random": "1", "pause": "1", "pause_on_click": "0", "pause_when_hidden": 1, "pause_when_hidden_type": "full", "amount_allowed_visible": "", "remember_slide": 0, "remember_slide_days": "1", "controls": "0", "items_per_slide": "1", "pager": "0", "pager_type": "Numbered", "pager_hover": "2", "pager_click_to_page": 0, "image_count": "0", "nowrap": "0", "sync": "1", "advanced": "", "ie": { "cleartype": "true", "cleartypenobg": "false" } } } });
//--><!]]> 

Not being a programmer, I cannot say where is the issue.

Probably related issues:
(I have read them but do not fit my issue)
#1109790: Conflict with Views Accordion
But it is related to D7 and the author relates it to Views Accordion issue
#1108480: Compatibility issue with Colorbox
It was a reprocess bug of Views Accordion, but in my case I do not have images inside Views Accordion. My issue happens trough the whole site, even admin pages.

My system configuration (shared hosting):
Drupal 6.22
MySQL 5.0.92
PHP 5.2.17
Apache/2.2.21
Acquia prosper main theme
Rubik admin theme

Modules and plugin installed:
Colorbox 6.x-1.1
Plugin ColorBox v1.3.18 (as said here: #1370196: Drupal 6 jQuery version too old for Colorbox plugin version 1.3.19 and later)
jQuery Update 6.x-2.0-alpha1 (Colorbox dependencies)

Locally tested on:
Firefox 9.0.1 (enabled: firebug 1.9.0, FireQuery 1.1, DrupalForFirebug 1.6)
Chrome 15.0.874.10 (using embedded inspect tool, so I do not think is a firebug conflict)
Xubuntu 11.10 (oneiric)