The problem I'm encountering so far (in 3.7.1 beta 8) doesn't seem to be related
to mosaic preview or AA, but rather to 'Continue_Trace' itself.

1) Start a render of a typical scene-- no AA--with mosaic preview's
Preview_Start_Size=128 and Preview_End_Size=32, for example (I'm using my
resolution .ini file rather than the command line). OR, no mosaic preview at
all.

2) STOP the render at some point while it is still pre-tracing. (At this point,
NO 'state file' has been generated.)

3) In the .ini file, turn on Continue_Trace.

4) Run the scene to completion. (I can't tell if the 'state file' was ever
generated, as it isn't there now either. But that's normal operation AFAIK-- any
state file *should* disappear once the render is completed.)

5) By MISTAKE, leave 'Continue_Trace=on' in the .ini file

6) Run the scene again, the same way --which seems to take no time at all. But
the render window doesn't show up, and the 'Show/Hide' button is now dimmed out.
(The message window says, "File already rendered and continue requested;
skipping", which makes sense, by itself.)

7) FIX the mistake of leaving 'Continue_Trace=on' by turning it off.

But *any* subsequent render of the scene-- or *any* scene-- does not show up in
the render window, and the 'Show/Hide' button continues to stay dimmed out. (The
scenes ARE rendering, but 'invisibly.') The only way to restore normal operation
is to quite POV-Ray and restart.

It seems that mistakenly leaving 'Continue_Trace=on' is the culprit here, at
least for this particular problem.

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