At the beginning of this month, AUGI (Autodesk User Group International) reorganinzed its website and forums. Due to an ongoing "situation" between AUGI and other entities that had been engaged to develop and host the site, all of the forum posts (and, apparently, archived ATP classes, as well) are not currently available.* So any previous links I have posted to threads or other information on the AUGI site are likely to be broken. It is unclear at this time if the old data will be restored, and, if it is, whether the old links will work.
* - See post #61 by Peter Jamtgaard and this blog article by Steve Stafford for two of the less inflamatory explanations of the current situation. Or, if you have the time and the attention span, read through all of the 367 (and counting) posts in this thread in the Revit Architecture Forum and try to figure out what is going on.