I borrowed an Inventor 2012 license the other day, I then opened 2013 and noticed it did not go up. So I borrowed another license for 2013. Not ideal but what ever. I went a day or two then at home, when I opened 2013 it gave me an error and said it needed the license server. I thought maybe I returned the 2013 when I was playing with the License Manager (Borrowing and returning in different versions and programs to test the results). 2012 worked and that was fine for what I needed it for. So I came back to the office and borrowed the license again, went home last night and tried 2013 again. I got the same error about needing the license server. Came back tot eh office this morning and looked and I still had a license checked out. Returned it and checked it out again and unplugged from the network, seemed to work fine. I am not sure what is going on?
Here's the deal on borrowing. If you borrow, it will only work for that one product. So even though Subscription will allow you to run 2012 and 2013, you would still need to borrow two licenses.
That being said, license borrowing failures off the network can be caused by a few things.
1. You borrowed while on a docking station and it fails undocked.
2. You borrowed with a WiFi or LAN card that gets disabled manually or by power saving mode.
3. You are logged in as a different user than the account you borrowed.
4. You don't have enough rights and your registry settings get reset back to default.
I am not sure what was causing this, but it seems to be fine now... The only other thing I can think is maybe where I changed versions? IE I borrowed 2013, then opened 2012 had to register with the OS to swap. Then I never when back to 2013 while still on the network so the software never registered the borrow in the registry. By going back and forth while still attached to the network it let it add the registry key and save the borrow so to speak?? Maybe??