The stack heap collision error is due to Second Life memory issues. It means a script has "died".
You can confirm that the respective toy is giving out the message if:
- while wearing the Signature toy, you tp and get the message; AND
- you detach it and you tp, and you don't get the message any more.
To fix, simply
rez a new set (e.g. by saying "/1g" or clicking the toy icon on the HUD).
If that doesn't solve the problem, then we need to
- re-setup the toy (say "/1." and hit "re-setup" on the menu).
- re-activate any plugins you have (not all Signature toys have plugins).
If this still doesn't work, it means that Second Life has probably corrupted your attachments, and you need to
update them.