I am having a similar problem, Mechanical takes much longer to load than it did when first installed. The following is what I see after the program loads, it hangs up after the "Loader application completed" and the 2 scripts show up. Are they always there or is Autocad looking for something it can't find?
Regenerating model.
Loading Mechanical modules.....
Loader application completed
_.UNDO _END
_.UNDEFINE XREF
AutoCAD menu utilities loaded.
AutoCAD menu utilities loaded.
Thanks
Jim