Had to change hard drive on a machine, got the licence reactivated no problem, I was back up and running, doing some work with the database today earlier in the morning,
I went to use the same machine again, The hardware ID has changed since the re-activation, what caused the ID to change again,? there’s been no changes in hardware since the re-activation
Did you need to reactivate Windows at all?
I got burnt last year when I migrated to Windows 7. I re-activated mAirlist, and a few days later got round to activating Windows. Changed the ID so I had to reactivate mAirlist. 
The windows activation was done before to reinstall of Mairlist. Mairlist was the last item to be installed.
Can a windows update change the ID?
[quote=“station31, post:3, topic:8778”]The windows activation was done before to reinstall of Mairlist. Mairlist was the last item to be installed.
Can a windows update change the ID?[/quote]
I would think not, and I’ve regularly updated mine with no issues.
I don’t know enough about how he secures the software, but I have been burned in the past with multiple network adapters (not with mAirList), in that the license bound itself to an active MAC address, then after a reboot it bound itself to another network adapter and failed the license as the MAC was different. I’ve also seen high end editing software go unlicensed when the user was on an ethernet connection at home then fail at a coffee shop because he was on WiFi and that the same issue as above! Don’t know if that plays into this or not.
When you had activated Windows, did you reboot before you activated mAirlist? I wonder if that order may have done something!
I’d recommend a quick e-mail to Torben explaining what has happened and the order in which you did things after replacing the HD. He should be able to re-activate your mAirList.
BFN
Cad
The Hardware ID is an encrypted (hash) representation of several aspects of your computer hardware and Windows system. To see which information is used to generate the ID, try saving an “hwid.txt” file:
(This is for v4.2 - in mAirList 4.3 the License Manager has been reworked a bit, the information can now be found on the “Hardware” tab.)
When the ID changes unexpectedly (which seems to happen once in a while), I cannot tell you why, because the ID is encrypted. But you can save the hwid.txt file when you activate mAirList, and if the ID changed unexpectedly, save the hwid.txt again, and then send be both files so I can compare then. (Actually recent versions of mAirList automatically save a copy of the hwid.txt file each time you activate the software, in the “ActivationLog” folder inside the data folder.)
[quote=“Torben, post:6, topic:8778”]The Hardware ID is an encrypted (hash) representation of several aspects of your computer hardware and Windows system. To see which information is used to generate the ID, try saving an “hwid.txt” file:
(This is for v4.2 - in mAirList 4.3 the License Manager has been reworked a bit, the information can now be found on the “Hardware” tab.)
When the ID changes unexpectedly (which seems to happen once in a while), I cannot tell you why, because the ID is encrypted. But you can save the hwid.txt file when you activate mAirList, and if the ID changed unexpectedly, save the hwid.txt again, and then send be both files so I can compare then. (Actually recent versions of mAirList automatically save a copy of the hwid.txt file each time you activate the software, in the “ActivationLog” folder inside the data folder.)[/quote]
Very interesting to know, thank you for that, Just for the sake of curiosity. I’m naturally nosey anyway, I had a look at the two activation log files in the data folder.
I noticed that there are 4 MAC addresses listed, two of which had changed between the two activations
The MAC addresses are not used by the algorithm, only the word “Unknown” should appear in that section.
Directly after the MAC addresses (or “Unknown”, more precisely), with no blank line in between (a bit confusing, admittedly) you see the list of the Hardware IDs: the ordinary HWID and the alternative IDs SHWID, SHWID2 and SHWID3. The latter use a slightly different algorithm and can be used to work around problems in multi-user environments with restricted user rights.
When you say that the first two IDs changed (HWID and SHWID), I assume that the harddisk configuration changed (models or serial numbers) - take a closer look at that section again.