Here is another Bug in 4.60 :

Just make a script with the following two lines for example:

$ffx = DelTree("HKEY_LOCAL_MACHINE\Software\Mozilla\Mozilla Firefox abc")
exit @error

The result:
failed to find/open script ...

with 4.53 and earlier all works fine.

comment:
As I can see 4.60 has lots of bugs. Itīs more a beta-version than a full release.