Rez a complicated object (Linked prims with lots of scripts in) then select it and try reset scripts in selection, it will only get a few scripts in and then hang. It doesn't reset any script it doesn't get to and it's variable how many scripts it will manage to reset. Resetting the same object multiple times will gradually reset more scripts until it manages to do the whole lot.
Numer of linked prims seems like a major factor, with a 79 prim object (About 10 scripts inside total) it doesn't even get to resetting a single script on the first attempt.