I am just starting to learn to use Maltego and have made an account. Whenever I try run a transform on a domain it says that I have an invalid API key but when I log in again and try again the window pops up again stating I have an invalid API key.
Which version of Maltego are you using?There is an update that maltego community has recently released and I updated yesterday only.
So make sure you are running the latest version of maltego ce .
I am getting the same problem Did you solved it ?