“./vtiger6/libraries/guidersjs/guiders-1.2.6.js”

This script throws a Firebug error about myGuider.attachTo

Upgrading to the 1.2.8 version helps.

else change these lines

guiders._attach = function(myGuider) {
if (myGuider === null) {
return;
}

to

guiders._attach = function(myGuider) {
if (typeof myGuider !== ‘object’) {
return;
}