Lags & Invisible, Frozen & Stuck Sims --> Post here if you have the issue.

General problem people are seeing

- Sims get stuck in bed and on other furniture. Reset sim helps once, maybe twice then it stops working
--> Possible Workaround posted by zerobandwith
- Sims get stuck on each other, leaving large groups of Sims in one space
- Sims turn invisible, only leaving the thought bubbles visible
- Lags because of the stuck Sims or temporary cars that don't get cleaned in the streets and inactive Sims inventories
- Toddlers get stuck on top of the stairs while trying to interact with t/ya/a/e
- Sims get stuck in two locations in Bridgeport behind the hospital in Bridgeport for this should be an inaccessible area but isn't
- Frozen Game where only the animations go on.
- Invisible Objects that block the Sims path
- Sims are getting reset and send back home.
- Sims are getting reset from work and are now standing outside some rabbit hole
- All sims get drawn to one spot
- Sims getting stuck in elevators
- Ultimate loss of your save game: Missing GUI (this can be caused by uninstalling an injector mod the wrong way but that's not always the case)

Play style, system info, Mods/CC status
- Most people in this thread have more then adequate systems, are up-to-date and have tried everything from reinstalling to reformatting and nothing works. The error can't be point pointed to any group of hardware. It occurs on all OS, including Mac. The more EPs you have, the faster you have it.
- Most people in this thread do not have any cc or mods although it shows that people that are using Twallan's mods are inclined to have less problems
- People have different play styles but lots seem to keep to one household, playing legacy style.
- The error seems to occur around week 10 or a little later into the game. Once you have it, it seems to infect other save games, also new ones.
- This problem has been around since the beginning but seems to get worse with every EP/SP that's coming out, LN making it a problem for a lot of people. You don't NEED LN to have the problem and it's not only happening in Bridgeport.

Invisible Sims - Reasons
This info is speculation and might or might not be true
So far I think there are three problems that can render your Sim invisible:

- Large crowds, stuck sims that make your game laggy and because of this the graphics have trouble actually displaying the Sim. This is only a temporary invisibility and they can turn visible any time. Overwatch gets rid of crowds in front of community lots because of star opportunities.
- Broken outfits. No clue what breaks them but Twallan pinpoints them on cc that is being uninstalled from the game. That's certainly true for invisible babies when you uninstall bad cc. Could be other reasons. Fix Invisible Sims on DebugEnabler fixes those
- TestBrawlError. The error occurs at a point in time where the other sims are leaving rabbit holes, buses or other actions that make them temporarily invisible. Because of the error, the game bounces and the Sim does not get visible. ResetSim makes those visible again but there could be other problems following (like the stuck in bed issue). Overwatch and ErrorTrap get rid of the TestBrawlError

Mods, that actually help with all those problems (don't solve it)

All Mods are by Twallan. There are others around (Google: NRaas, ISZ).

Overwatch --> Getting rid of temp cars, broken relationships and family trees and the Sims get drawn to one community lot problem, also has many more fixes, refer to Twallans forum on the details.
MasterController --> Ability to reset the whole town (Sims & Objects)
DebugEnabler --> Ability to fix invisible Sims with faulty outfits
ErrorTrap (CoreMod) --> Fixes dangling references and can help with the missing UI problem and more.

A solution to the routing problem in Bridgeport can be found here: Bridgeport Routing Fix

If you decide to use a mod, make sure you remove them before patching your game. Overwatch, DebugEnabler, MasterController and ErrorTrap are save to remove without any special instructions. Simply delete the files and remove your cache files.

ErrorTrap is a CoreMod and can only be used with the Patch stated in the Twallan's post.

For instructions on how to get a mod into your game, please check this thread: http://forum.thesims3.com/jforum/posts/list/217955.page

to be continued ..