Hey Chris,
>> "Is there someway to see who changed it?"
No we don't keep logs of changes to the web API keys.
>> "Could it have been changed when we bumped levels in licensing?"
Nope, it was done by someone with access to your account. Our recommendation is to give every user of LimeLM their own separate login: https://wyday.com/limelm/help/add-users/
This way you won't run into issues of multiple users using the same LimeLM user account to manage an account.