existing tag assigning bug in chrome

Besides the already mentioned bug with new tags in another topic I also have a bug with existing tags in Chrome 3.0.195.21.
When selecting an existing tag for a user story item in either the backlog or sprintlog in Chrome I get an 'An error occured while processing your request' message on the page.
The Chrome browser also downloads a file 'backlog_item_tags' (content of the file is shown below) but the actual action of assigning the tag does get executed.
This bug did not appear in Firefox 3.0.14 browser.

'backlog_item_tags'-file content:
{"item":230064113,"html":"\n\u003Cli class=\"tag tag-353748784\"\u003E\n \u003Cspan\u003Ev1.6\u003C/span\u003E\n \u003Cform class=\"functional-form\"\u003E\u003Cinput type=\"hidden\" value=\"http://desktopdesign.bananascrum.com/projects/ia/items/230064113/backlog_item_tags/353748784\" name=\"url\" /\u003E\u003Ca href=\"#\" class=\"deattach-tag-link\"\u003E \u003Cimg alt=\"Remove this tag\" class=\"trash\" height=\"16\" src=\"/images/icons/delete_tag.gif?1254400339\" title=\"Remove tag from item\" width=\"16\" /\u003E\u003C/a\u003E\u003C/form\u003E\n\u003C/li\u003E\n","tag_in_cloud":"\u003Cli id=\"tag-353748784\" class=\"tag-cloud-item\"\u003E\n \u003Cspan class='tag-name' title=\"Click to cycle filters\"\u003Ev1.6\u003C/span\u003E\n (\u003Cspan class=\"tag-count\"\u003E\u003C/span\u003E)\n \u003Cspan class='tag-cloud-controls'\u003E\n\u003Cform class=\"functional-form\"\u003E\u003Cinput type=\"hidden\" value=\"/projects/ia/tags/353748784\" name=\"url\" /\u003E\u003Ca href=\"#\" class=\"destroy\"\u003E\u003Cimg alt=\"Delete this tag\" class=\"trash\" height=\"11\" src=\"/images/icons/trash.gif?1254400339\" title=\"Delete this tag\" width=\"10\" /\u003E\u003C/a\u003E\u003C/form\u003E \u003C/span\u003E\n\u003C/li\u003E\n","tag_id":353748784}