New Stairs don't work

Haven't tried with round roof but otherwise they work fine for me.

Others have reported this as some conflict with a mod/cc so could you make sure to delete the following file: documents\electronic arts\the sims 4\localthumbcache.package. and also make sure there's nothing else in your mods folder than the resource.cfg for testing.

Always delete the folder, localthumbcache before I start a game. Only folder was mods, resources.

@CLMerz1948 Is it just the climbing or do you also have issues with the diving in or do you mean the normal stairs ?

Does it not work on any build with any Sim or only for Mermaids or Vampires ?

Tried using the stairs mastercraft, steps of wood, lava steps. All of them worked fine in other towns. Tried them again in Sulani and only the Lava steps would work right. The other caused the error of the sims not climbing the steps, just appearing at the top and bottom.  I'm pretty sure  the roof thing and stair thing are new errors to the Sulani game, didn't have the problem before the new game was installed.

Also didn't have any mods in game when I tried this.

@CLMerz1948 I'm guessing we're talking about different things. lol

Let me check again.

EDIT: Still can't duplicate this but I'll let a builder try this.

Does it happen on any Sulani Lot ?

Don't know about that any lot thing, just the one lot I built.

In case this helps, the lot I built is called Island Vacation Home, I uploaded it to the Gallery yesterday. Had to change the stairs to a normal set to get it to work. I build lots of houses.

I was going to test your lot but there are 6 "Island Vacation Home" lots in the gallery and none have your ID. Do you have a different ID in the Community Gallery? 
@crinrict I have tested in my game and also cannot reproduce. See screenshot below: 2-story build with a round roof, regular height walls, and Island Living stairs (not lava). The sim went up the stairs normally, and did not 'skip' the steps part, gitter around during the process or any other odd behaviors.

Unfortunately, the large patch/update brought in many changes. These types of changes effect many aspects of the game. Mods and CC involve code that can sometimes clash with the updated game code, and even cause damage, if not properly updated to match the new changes in the game's codes. Even after you remove the Mods/CC, sometimes damage can linger in the game code that can be addressed by removing cache and repairing.

Perhaps, @CLMerz1948 , you could humor me and just to be sure try the following again, exactly in this order and without adding back any mods/cc afterward, then re-test?:

• Exit your game then exit Origin. Copy the Mods folder from your 'The Sims 4' folder onto your desktop (for future reference) then delete the mods folder and the localthumbnailcache.package file in your 'The Sims 4' folder and restart the game and so that the game will re-create the folder.
• Then run a game repair [ Open Origin, click 'Game Library' then right-click Sims 4 > Repair Game ]. Make sure to let it run until it has completed all repairs (it will do the basegame first, then run through each of your expansions/packs). After that, please see if the issue has stopped.

If It fixes the situation I would recommend that you check with the Mod and CC creators to see if there are any known issues with their Mod/CC clashing with the update and if so do they have an updated Mod/CC that will address the changes in the game's code from the update. You can then re-add your updated Mods/CC one at a time to see if one was conflicting with the function/causing the glitch - but do not re-add the old config file from the old mods folder, as it is possible for it to have become corrupted also.

Nope, It's CLMerz48.