EM 12c console times out after about 10 minutes

Hey all,

My next EM 12.1.0.1.0 issue is that the console times out after about 10
minutes.  The webpage goes "grayish" and depending what page I was on,
sometimes there's a single small "bang" in a yellow triangle in the middle
of the page where I can click on the page to restart the auto-updating of
the metric displays, but other times the webpage is completely inaccessible,
except to reload from the browser.

I did set the console timeout as per the install guide using:

./emctl set property -name oracle.sysman.eml.maxInactiveTime -value 900
-sysman_pwd mysysmanpwd

...and restarted the OMS.  But since the default timeout is supposed to be
45 minutes, the 10 minute timeout I'm getting happens way before that
anyway.

Specifically, I'm seeing this on a database "Home" page (with the "bang"),
and the database "Performance Home" page (without "bang").

Anyone else seeing this?  My 12c is all on a single OEL 5.8 x86_64 box w/2
CPUs and 6GB RAM.  I'm using various browsers including FF 11.0
(unsupported) and IE 8 (supported), with consistent results between them.

TIA,
Rich

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