HELS was the source of many save game errors and crashes to desktop for me. I do not know what specifically is in there that caused me problems. To prove it was HELS, I even reloaded my computer fresh, loaded just Sims 3 base and WA, and all patches of course. I never had a single problem for 3 weeks. Zip, nada, nothing. No glitches or anything. I was in heaven!
Installed HELS and had a crash that night.
Uninstalled HELS and went error free again for a week. Oh well, there wasn't really much content I was using in that stuff pack anyway. I don't play many high end houses.
Then Ambitions came out, installed that and back to crashes and glitches! But at least I'm not alone here.