OK, so a few days ago I renewed my Forest Pro subscription for my standalone FP. Downloaded the updates and installed and used the software for several days without issue. Same license code as always.
Then today, I'm in MAX and I merge in from another MAX2014 file a bunch of stuff including my FPtrees from that file. The FPtrees were hidden. So I then go to unhide the FPtrees and they unhide fine (they were displayed as box by the layer settings). Then I go to render the frame and I get an error message that I need a license, blah blah blah. I have a license. So I select the FPtrees and try to go to the modify panel but nothing will display in the panel. So I reset MAX and try to create FPtrees from scratch but no joy. So I close MAX.
So I go and find where the license manager lives and open it and it says both my license of FP and RailClone are fine and active. I try to make FPtrees in MAX again but no joy. So I go back to the License Manager and click 'add' and re-enter my code and re-authorize and all is fine (I have X more authorizations, etc.) and both my licenses show in the list as before. Now FP is working again in MAX.
But why did this happen? I changed nothing about MAX or FP.