I can't climb the stairs on my Elven Inn in Owl's head. Tried two characters. I have to go to a corner and jump to gain access. It happens every time. My tax free vendor also remains invisible unless you cast a light or see in the dark spell. It is the Tara's Rest on Drover's road just as you come in town past the boulders on the left. The vendor is a BMC Enterprise vendor. I have 64 GB of ram with an Intel (R) Core Processor I5 6600 K, 3.5 ghz. Using Windows ten but for SOTA it's in Windows 8.1 mode. Been using this setup for a year.