(This item pertains to the Probe Utilities dialog box, accessible through Insert | Hardware Definition | Probe.)
The Reset Tips button resets any selected tips in the Active Tip List so that they are no longer calibrated. This provides you with a quick way to reset tip data back to their theoretical values. Previously, you had to delete and then add the tip back in to accomplish this same thing.
If you do not have any tips selected when clicking this button, you will be prompted to confirm whether or not you want to reset all the tips. If you choose Yes, then all the tips will be reset, otherwise no action will be taken.