HELP - Map Issues

[iLucian]

So i have been making a custom story and ive made about 5-6 levels and they all have worked fine, but for some reason when i tried to play the latest one that i built, it wont load. The level used to work fine, but when i added onto it and restarted the game to play it again, it either turns completely black or stays on the loading screen... i am getting no error report or anything.. if anyone would help me i would be very happy. thx.
_______________________________________________

I am making a custom story and I have made about 5-6 other levels, but my latest one has been having some problems that never showed up before on any of the other maps. Here are all of the issues:
1. When i focus on something, it doesnt let me grab it, no hand appears.
2. The monster is seeing me through the walls...? It has killed me through a wall before. ?

Can somebody PLEASE PLEASE help me! I am having alot of issues that i need resolved. If these issues cannot be fixed, i will most likely not put this map into my custom story. PLEASE somebody HELP! thx..