On attempting to exit from PI ver 1.08 1092 (win 7 64bit), the following messages appeared :
i) "PCL Win32 system exception 000007FEFD23940D with exception code C0000005. Access violation invalid memory read operation at address FFFFFFFFFFFFFFFF8."
(ii) " Terminating the core application with locked views is a risky situation situation that denotes incorrect behaviour of one or more installed modules. Perhaps you may want to fix the locked state(s) manually if possible. Exit anyway?"
All processes, views, files etc had been closed and I found no "locked views". I then forced an exit from PI.
Pete