Okay. Let's see. A bit ago I was having problems with just loading lots, as in they would load and directly after I unpaused them it would crash. Went through the half-thing method, took half my downloads out and eventually solved the problem. It seemed to've been the hacks "Teen - Adult Attraction & Skunk Fixes' and 'Pregnancy Wear Any Outfit'.
I'd also made a big mistake prior to the problem, where I moved the Pleasants to another neighbourhood the MTS2's 'wrong way'. Destroyed them, and that neighbourhood.
My game hadn't crashed since then, but I did have annoying little problems that were: 1. Whenever I canceled a command and had other command following that one, all of those actions were cancelled. 2. Whenever (on any screen, buy mode, live mode, whatever) I moved the cursor over any wardrobe it would read 'There are no actions available' and all the sims on the lot would 'jump' and have all their actions cancelled. This would happen even though I had thousands of dollars of clothes for them.
My annoying big problem was after all of the above, two of my sims had twins (through use of the simBIO hack Triplets & Quads) and they were both put in their cribs. One of the boys was fine and went to sleep. The other was in the weird state where he was half in and half underneath the crib. His needs were going down, but every time I attempted to get one of the parents to get him out of the crib, they would just stand in front of the crib, would 'jump' but the action of Hold [child] would remain. The father died of starvation (his needs were still decaying through this) and so exited out of that lot and deleted the family in-game. I then proceeded to completely delete that neighbourhood along with Veronaville (never played and Strangetown (never played).
Fast forward to earlier today. Different sims, neighbourhood, etc. Have a sim couple they have twins (via inTeen and inSim). I decide that I don't want to take chances again with the crib-jump-killing scenario so I enter the 'agesimscheat on' and try to set their ages to toddler. The infants were made selectable and I tried to click on them to set age and the panel around the head pic would cancel out before I selected anything. I tried a few times and then the dreaded message appeared and the game crashed.
Extra help information:
I have only the base game and nightlife.
All of the hacks/mods that are in my download folder are (all are either inTeen, inSim, or from simBIO (excepting the vampire sunblock) and I thought I checked compatibility: Same Sex Have Child Want Not Adoption Want, inTeen flavor paks No Failing Miscarriage, No Fail Birth Control, Abductions - Higher Odds, Age Transition - Teens Keep Loves, No Friends Needed for careers, LycosV's  Vampire Sunblock, Same Sex Marriage, inSIM for nightlife, and inTeen for nightlife.
Please help if you can! Any additional information on the matter will be readily provided!