Thanks for the guidance @jtp10181
Thinking something similar in the past, I removed the LCM and reinstalled. That did not seem to make any difference. After re-installing LCM, the same users and codes were displayed. Stuff was not wiped. Makes me think you are referring to some other procedure.
Did I miss a recipe, support note, or something to guide the effort?
I did not have to do that with my Schlage lock. So it's not a requirement or anything.
I just had to remove the lock codes and put them back again. I had migrated with encryption enabled which is not recommended evidently, which was causing me problems with editing or updating codes. However all the codes worked fine after migration, It was just adding and updating that was messed up.
See this post above for how to remove the codes from the devices. The codes are stored on the devices, and visible in the device pages. LCM just brings it all together in one place.
Whoops. Forgot about that @jtp10181 . Thank you 
Cleared the "Front Door" and "Apartment", kind of.
What is that all about? Position 251 when "maxCodes: 250"? Does that make sense? And, 251 can't be deleted in the device screen. LCM agrees and generates a lot of "debug" entries and a bunch of retries when I try to use it to delete 251.
A few of the retries showing in the log. There are several more. Don't know why but the .png of the log will not load into this message. Will create a separate message with the log.
Now need to add the codes back into the locks. First try will be with lock manager.
Cheers
On Schlage locks (is this a Schlage?) IIRC there was something funny about the first code on the lock being different than the rest. Don't remember the details...wonder if it could be that...
Tried to use LCM to add a code. Got an error.
That generated a lot of log entries. About 30 retries.
Checked both locks in Devices and the new code is not displayed.
These entries showed up when I exited LCM.
Hope this helps narrow down the issue. I'm now going to use the Device to add codes to the 2 locks so they can be used by the crew. 
Need more expertise than I have...fortunately mine (Schlage and Yale) have mostly behaved themselves so I haven't run into these types of issues.
Does 7775 work to unlock the lock?
Great question @danabw . It certainly does, so I tried to "disable" the 7775 code in LCM and that generated a cascade of "debug" messages.
I'll spare you the other ~240 entries in that sequence! 
I don't see a way to set "disable" in the Device screen. Perhaps there is some "Configure" button magic that could accomplish it? shrug
Thank you, sir
Mine does this too ..
floods the system when i add or check codes.
all 250 of them lol
Delete users and code from the lock itself on the lock device page.
Guess I got my info mixed up, it is the Yale that has 250 slots, the Schlage only have 30.
It seems like that slot 251 code is what is breaking everything.
Here is what I would do now at this point.
If that code is still in the lock, hopefully this will put it in the correct slot in the code list on the device page. Lets see what Current States looks like after that.
You could also Test out LCM by ONLY selecting the "Front Door" lock which was fully cleared out. See if it will work correctly for only that door first before adding the other door to the users.
Hey @rlithgow1 , yeah, I deleted all entries using the Device page for both of the 2 locks. Tried to delete position 251 from Apartment with no joy. Rather interesting that there was no clue that the operation executed, succeeded, failed, or decided to take a vacation. Nothing displayed. Nothing in the log. The net net was I couldn't delete the 251 code. Check out the 3 screen captures from a couple posts ago. (We now measure time in "posts"? 
)
Thanks for thinking with me!
Can't remember if we asked, is there any option to delete all codes on the lock itself?
No sweat, @jtp10181
Yeah, I kinda suspect that 251 thing may be at least an indicator or side effect of the root problem. What is that? No clue and that's why this thread is so damned valuable and apprecited. Thanks
Will get back here later today and work those steps to see what we get from the effort.
Just for reference ..... here is today's LCM view of the world. All names are on the Front Door lock.
And the corresponding log from opening LCM.
Everything looks desirable except that pesky 251 slot.
Cheers
Yeah looks like you are getting closer to having it working again. My instructions up above should take care of that slot 251 code.
Finally getting back to this. Sorry for the delay.
Thank you @jtp10181 .
Using LCM, deleted failed jobs. I see 10 attemts by LCM in the log.
Drat. In LCM "null" remains. Persistent bugger.
Refreshed the browser screen for the device. It also shows "null" remaining. Double drat.
Also tried deleting the code from the device screen. No joy.
Questions. Not clear on the next steps.
Guess I get sent back to the "HE 101 class"?
Much appreciated!
FYI, I don't think 251 ever showed up in the Front Door. I think it was only an Apartment anomoly.
The "Type" dropdown on the device page.
Make note of the current type (aka Driver). Switch it to "Device" and save.
Then you will see the two command buttons I am taking about up top.
Once done switch back to the original driver and save.
The follow the rest of the steps I listed above.
Thanks for the clarification, @jtp10181
Clearing the lock seemed to work properly. I'll add a couple captures to make this thread useful for future readers.
Changed the driver to "Device" using the "Type" dropdown. These buttons were displayed. I used "Delete All Current States", "Delete All Scheduled Jobs", and "Delete All States".
Changed the driver back to "Generic Z-Wave Lock"
The log shows Apartment codes have been cleared. The Device page also showed the values cleared.
The LCM showed the "null" user and the failed attempt. Used LCM to clear that user. Seemed to work. Now looks like this
Tried using LCM to add the Apartment lock to the user David. An error appeared.
The log showed this.
Opening LCM to stimulate a log entry shows that
Entered the 7775 code on Apartment and the lock opened. It is shown in the log. Our old friend is back. Gobs o fun!
Hmmmmmmmmm. That makes me want to crap in my hand and rub it in my hair.
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