Purchased Lifetime SPAT starting with May 16 version. (Win 7 home Pro, Offline)
 
Offine system, offline authorization performed.  Up and running...
Upgraded to June 16 version, and noticed that software update required no new offline authorization.
 
Cool!
 
Worked on a number of things in June Platinum.
Started a project this morning and got the "Demo Mode, can't save." RED alert this morning.  Wut?
 
Shutdown JUNE 16 SPLAT, Reopened a project and did test save.  All good.  Do the project - 3 hours. Save, export, etc.  All good.
Shut down Said SPLAT.
 
Later this afternoon I start SPLAT and yup, "Demo Mode, can't save." RED alert again.
Vert the vert?
 
Shut down and restart SPLAT.  No warning.  Open project, test save.  All good.  Huh!?
 
Work on project for maybe 30 minutes.  Try and save and get the "you sure you want to shutdown, you're in demo mode."
 
WTF?    Grrrr....
 
Did offline authorization again. We'll see if that works.
 
Of note: My Sonar Platinum Help-About (when this whole thing was happening) said:
Membership valid through 12/24/2037  Status Owned Version 22.6.0 Build 26 [2016.06] x64
 
Anyone else see this weird behavior? 
Is re-authorization for each installed periodic release required?
 

It should not be required. We'll look into your account as soon as possible.
Did you get a warning before this?

Apologies.  This was supposed to have been addressed in the build but it seems the wrong internal library got built in.  We'll resolve it in the next update.  In the interim, it's not necessary to re-auth, just restart the program if the issue occurs.
 
Keith

Thanks guys - I did a re-auth just in-case.
 
So far, no issues.  :D