I tried to save over an old savefile and got this message (plus a crash):
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Illegal exception
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An exception 0xC0000005 occurred in ACWIN.EXE at EIP = 0x00504CD0 ; program pointer is +379, ACI version 3.21.1115, gtags (2051,32)
AGS cannot continue, this exception was fatal. Please note down the numbers above, remember what you were doing at the time and post the details on the AGS Technical Forum.
Not been able to reproduce it but if this meens anything to anyone, without plowing through my messy scripts, please give a shout.
This is the crash dump (https://dl.dropboxusercontent.com/u/42681740/CrashInfo.3.21.1115.dmp) if anyone is still reading those.
Edit: There were also a number of things going on in rep_exec_always when this happened.