Sims Will Not Go To School And More

I started doing the 50/50 method by splitting my CC/Mods folder into two separate folders. When I put each section into the game one at a time, everything worked fine on the high school lot. I also used my mod detector again, and it showed a few items were conflicting; however, I do not think it is accurate as the few items that popped up as conflicts are CC items that I most recently downloaded, and this problem has been going on long before I downloaded those items. I did remove one older Mod that it stated was conflicting with another and loaded the game to play afterward. I played on the high school lot for two sim days, and everything worked fine, so I assumed the item I removed must have been the problem. However, I just started a third sim day, and the game is malfunctioning again. The sims stand on the sidewalk and will not move. I do not think the older item I removed was causing the problem or conflicting with the other Mod the detector indicated either, as both of those Mods were together in the first batch of the CC/Mods folder that I put back into the game while doing the 50/50 method and they worked fine. I am unsure where to go from here, as I have also repeatedly repaired the game through the Origin app. 

Should I try attending high school in a new game or using another family, perhaps? I am still unsure if this is entirely a CC/Mods problem because the game is working fine one minute, and the next, it is not. By the way, when I removed the entire packages folder and played on the high school lot for a few minutes, everything also worked fine. I will remove everything again and see if it malfunctions on the high school lot after playing more than two days in a row with a different family. This is the only other thing I know to try.

Additional Questions I Have:

1) Is the high school lot supposed to look really dark and muggy outside when you load it to play during the school day?

2) Is the prom event supposed to show on the calendar because mine is not showing? (Not to mention, over the past weekend in the game, a popup came along asking if I wanted to attend prom, and when I selected to attend, nothing happened, and my sims remained on their home lot)[1ST NOTE: This happened before I removed the older CC item while doing the 50/50 method][2ND NOTE: I do not and have never used MCCC]

3) Why do lots in the Pendula View neighborhood of Willow Creek have a pink tint when viewing them from the World map? They did not look like that initially.

4) If a CC/Mod item is not currently being used on an active sim, can it still interfere with game performance and cause malfunction during gameplay?

All help is much appreciated.