Morroblivion

So I have not found out anything about this anywhere so had to post.

Background info:

I had completed House Hlaalu quests, Morag Tong quests, Imperial Legion quests and all this time I could enter Caius Cosades' House anytime, no problem. Over time, I kept storing every unique item I collected. Now, I am at the final Main quest stage and have talked to Vivec.

The bug:

I just wanted to store one final item and I try to enter and the grey screen appears. The direction bar is there as well as the + mark at the center of the screen. But I can't move anywhere nor can I go back outside, I have to restart a load. This had happened once before and in that time I had waited for some time and it worked but NOT this time. I tried switching HDR off, doesn't work. This problem does not happen anywhere else. I do not have many Morroblivion mods. Anyways this is my mod list:-

Active Mod Files:
[spoiler]
00  Oblivion.esm
01  Morrowind_ob.esm  [Version 0.65]
02  Unofficial Oblivion Patch.esp  [Version 3.5.7]
++  Oblivion Citadel Door Fix.esp
03  DLCShiveringIsles.esp
04  Unofficial Shivering Isles Patch.esp  [Version 1.6.0]
05  DLCHorseArmor.esp
**  DLCHorseArmor - Unofficial Patch.esp  [Version 1.0.9]
06  DLCOrrery.esp
**  DLCOrrery - Unofficial Patch.esp  [Version 1.0.7]
07  DLCVileLair.esp
**  DLCVileLair - Unofficial Patch.esp  [Version 1.0.11]
08  DLCMehrunesRazor.esp
**  DLCMehrunesRazor - Unofficial Patch.esp  [Version 1.0.8]
09  DLCSpellTomes.esp
++  DLCSpellTomes - Unofficial Patch.esp  [Version 1.0.1]
0A  DLCThievesDen.esp
0B  DLCThievesDen - Unofficial Patch.esp  [Version 1.0.15]
0C  DLCThievesDen - Unofficial Patch - SSSB.esp  [Version 1.0.14]
0D  DLCBattlehornCastle.esp
0E  DLCBattlehornCastle - Unofficial Patch.esp  [Version 1.0.12]
0F  DLCFrostcrag.esp
10  DLCFrostcrag - Unofficial Patch.esp  [Version 1.0.10]
11  Knights.esp
12  Knights - Unofficial Patch.esp  [Version 1.1.8]
13  Oblivion_Character_Overhaul.esp  [Version 2.03]
14  NAO.esp
15  RoadLights.esp
**  OCO DLC Faces.esp  [Version 1.3]
++  OCO_Eyes_Fix.esp
16  Enhanced Vegetation [125%].esp
++  Enhanced Vegetation SI.esp
17  Morrowind_ob.esp
++  Morrowind_ob - MorroblivionTreeReplacer.esp
18  Morrowind_ob - Conversation.esp
19  Morrowind_ob - UCWUS.esp  [Version 1.5.1]
++  CWU-OnSelf-HotFix.esp
1A  CyrodiilTransportationNetwork2.esp
1B  Morroblivion - Silt Striders.esp
1C  Morrowind_ob - Chargen and Transport Mod.esp  [Version 12]
++  Ak- Morroblivion Maps.esp
++  morrob_tarvyn_faren.esp
1D  Bashed Patch, 0.esp
[/spoiler]