Most current firmware for zd1100 installation? (October 2016)

From release notes for Zone Director version 9.9.1  - DATED  - MAY 2015
https://ruckus-support.s3.amazonaws.com/private/documents/745/ZoneDirector%209.9.1%20Release%20Notes...
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Officially Supported 9.9.1 Upgrade Paths The following ZoneDirector builds can be directly upgraded to ZoneDirector build 9.9.1.0.31: • 9.7.2.0.9 (9.7 MR 2) • 9.8.0.0.373 (9.8 GA) • 9.8.1.0.99/101 (9.8 MR 1) • 9.8.2.0.15 (9.8 MR 2) • 9.9.0.0.205 (9.9 GA) • 9.9.0.0.212 (9.9 GA refresh 1) • 9.9.0.0.216 (9.9 GA refresh 2) If you are running an earlier version, you must first upgrade to one of the above builds before upgrading to this release.

NOTE: The upgrade path from 9.9.1 to 9.10 is not recommended due to the fact that the 9.10 release date occurred before 9.9.1 and therefore 9.9.1 includes bug fixes that are not in the 9.10 code.
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Now release notes for Zone Director 9.10.2 - DATED JAN 2016
https://ruckus-support.s3.amazonaws.com/private/documents/938/ZD%209.10.2%20-%20Release%20Notes%20-%...

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Officially Supported 9.10.2 Upgrade Paths The following ZoneDirector builds can be directly upgraded to ZoneDirector build 9.10.2.0.11: • 9.9.0.0.205 (9.9 GA release) • 9.9.0.0.212 (9.9 GA refresh) • 9.9.0.0.216 (9.9 GA refresh 2) • 9.9.1.0.31 (9.9 MR 1 release) • 9.10.0.0.218 (9.10 GA release) • 9.10.1.0.59 (9.10 MR 1 release) 
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there are other details that are important about factory reset you will need to think about

BUT this document from 7 months later makes no reference to the problems mentioned in May 2015. Is this Minority Report precog stuff?

Your call!

In case you are wondering I'm running 9.10.2 (R500+7363 mix) with no issues (for my configuration).

I have no idea what it is.  I was going to go 9.8.2.0.15 -> 9.9.1.0.31 -> 9.10.2.0.11, but once I hit the "9.9.1 to 9.10 not recommended due to release dates" thing, I went full stop to try to figure out the proper path.

So before you were on 9.10.2.0.11, what firmware were you on?  I'm not real keen on going through a full reset.

Here's a screnie of my image file repository which gives a petty good (er, precise)  idea of my upgrade path. Until my 7363 stopped being supported (9.12 and above) I upgraded regularly.

Note: I went from 9.9.0.0 to 9.10.0.0 and skipped 9.9.1 (must have been asleep)!

Never reset to default on any upgrade. But I might have been lucky.

I am only relating my experience.
Might well be worth a tech support query to get their view.
I am glad I'm not the only one who reads release notes before upgrading.

Well, according to what we both quoted, you're on a firmware that's not optimal, since

9.9.1 includes bug fixes that are not in the 9.10 code

Will the actual most current firmware please stand up?  Is this sentence inaccurate?  Is 9.10.2.0 release 11 missing bug fixes vs 9.9.1?  That sounds like nonsense from a version release perspective, but that's what I'm reading...

That note is about the 9.10 GA (9.10.0.0.218).  9.10.2 is definitely newer than 9.9.1, and has more bug fixes.

You'll see this fairly often with some manufacturers- a maintenance release to an "older" release is actually newer than the latest "new" release, at least until the "new" release gets a patch.  9.10.1 was that release in comparison to 9.9.1.

I have updated from 9.9.1 to 9.10.1+, and had no issues with doing so.  That being said, my typical upgrade path from what you are running is 9.8.2 -> 9.9.0 -> 9.10.2.  I would suggest doing it as soon as feasibly possible due to the NTP bug present in your release.

I appreciate the info, Mitchell.  Let me throw one more detail at you: there are 3 releases of 9.9.0: 
9.9.0.205 = GA Software Release
9.9.0.212 = GA Refresh
9.9.0.216 = GA Refresh #2.

For your middle step of your workflow, would you consider the version of the 9.9.0.x family chosen to be arbitrary, or is there a reason to use or avoid any particular option?

In case anyone revisits this slightly convoluted thread latest 9.10 (as of Nov 2016) is now 

9.10.2 build 29 (aka 9.10.2.0.29 aka 9.10.2 MR2)

in release notes there are numerous security fixes from interim builds 16 & 22...been on my ZD for 2 days and is running fine.

Ha!  Thanks for pointing this out.  I brought my ZD up to 9.10.0.2.11 just a few days back, and I thought I was current.  You show me I'm not.

What's the ideal way to stay informed of new ZD firmware releases?  Does Ruckus tweet them, have an RSS feed...?