When you have captured a packet log in packetry, it will overwrite that log without warning if you then click on the record button.
It may be beneficial to add a warning msgbox to let the user know that they will lose their current packet log if they proceed. This is similar to how wireshark currently treats this situation.
The msgbox could have a tickbox to "do not warn me anymore this session".
Also if the packet log was already saved to disk somewhere, then perhaps the warning msg would not be needed.