Chances are that lot got corrupted but I doubt it is because of the testingcheat. I have it at on all the time and that never happened to me. Unless you chose an option you should have not, it cannot corrupt a lot.
It could be cause by outdated mods or some hack conflict so make sure all you are using is compatible with the latest ep you have install. Also, the portal could now be missing for some reasons.
You could try to fix your lot using these tools:
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Hack detection tool found at
http://www.simwardrobe so you know if some of your mods are conflicting with one another.
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Sim clean installer which can show you what mod you have in your game that you might not be aware of, you can get it at modthesims2 (mods will be highlighted in red)
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FFS lot debugger which contains many many lot debugging tool, can be found
HereYou can also try to completely remove your download folder to see if it is cc related or not. If even without any cc the lot is still bug than simply move the family in a new lot and make sure to bulldoze that corrupted lot.