Sometimes, when I attempt to enter the gold horse courier buildings in any given city, I get an instant black screen. Sometimes I have to reboot, sometimes I have to ctrl+alt+delete, and sometimes it ctd's. My mod list is quite small so I can't imagine it would be a conflict, all I run is better cities, unique landscapes (+all patches), All Natural, enahanced economy, OOO, portable campsite, enhanced water, streamline and the official and unofficial patches. I have only logged about 27 hours on the save.

The only other bugs I ever seem to get in the game are frozen npcs and the odd audio glitch (hit-sounds/spells not playing occasionally), but I think they may be down to streamline (from what I have read).

Also, during the 27 hours played, I have only had one CTD. Everything is run through wrye bash, with a bashed patch, and through BOSS.

Any ideas on these small yet niggling problems?

Might be the nVidia Black Screen bug, if you have an nVidia card, that is.

Wrye Bash can fix primary cause of the bug in the Bashed Patch. I'd also recommend turning off Interior Shadows if you experience it, too, as that is another known cause for the bug.

No, it is not the nVidia black screen bug, as this building is added by Better Cities, and all interiors either added by or edited by Better Cities already contain the simple fix (really a work-around) to prevent that bug from occurring.

Which is why I mentioned Interior Shadows, as I have confirmed for myself that having those on caused the bug to occur.

But that one occurs only when you're in Sneak mode. If the OP isn't sneaking around, then the problem is something worse.

OP, could you post your full load order?

Oblivion.esm
All Natural Base.esm
Oscuro's_Oblivion_Overhaul.esm
Better Cities Resources.esm
Unofficial Oblivion Patch.esp
Better Cities.esp
All Natural.esp
Enhanced Water v2.0 HD.esp
Streamline 3.1.esp
Oscuro's_Oblivion_Overhaul.esp
OOO-WaterFish.esp
xuldarkforest.esp
xulStendarrValley.esp
xulTheHeath.esp
xulEntiusGorge.esp
xulFallenleafEverglade.esp
xulColovianHighlands.eso
xulChorrolHinterland.esp
xulBeachesOfCyrodiilLostCoast.esp
xulBravilBarrowfields.esp
xulLushWoodlands.esp
xulAncientYews.esp
xulAncientRedwoods.esp
xulCloudtopMountains.esp
xulArriusCreek.esp
xulPatch_AY_AC.esp
xulRollingHills_EV.esp
xulPantherRiver.esp
xulRiverEthe.esp
xulBrenaRiverRavine.esp
xulImperialIsle.esp
xulBlackwoodForest.esp
xulCheydinhalFalls.esp
xulAspenWood.esp
xulSkingradOutskirts.esp
xulSnowdale.esp
xulCliffsOfAnvil.esp
zulSilverfishRiverValley.esp
Better Cities Full.esp
Better Imperial City.esp
Better Cities Full FPS Patch.esp
Better Cities - All Natural.esp
Better Cities - Unique Landscape Barrowfields.esp
Better Cities - Unique Landscapes Chorrol Hinterland.esp
Better Cities - Unique Landscapes Cheydinhal Falls.esp
Better Cities - Unique Landscapes Skingrad Outskirts.esp
Better Cities - Unique Landscapes Imperial Isle.esp
All Natural - Indoor Weather Filter For Mods.esp - (this is imported into the bashed patch, but not activated)
Bashed Patch, 0.esp

That's a different bug I know of it, and I don't believe there is a way to work around it with mod editing (though if disabling interior shadows avoids it, that'll have to do).

Tiris, you listed:
All Natural - Indoor Weather Filter For Mods.esp - (this is imported into the bashed patch, but not activated)

Please read that bit in brackets and confirm that you have followed the instruction and kept this ESP inactive.

yeah I have, I actually wrote the bit in brackets. : P

thanks for trying to help by the way.

Then what happens when you rebuild the bash patch without that ESP?