I'm experiencing an anomaly on the third tunnel east of Belton whereby the western portal of the tunnel is obstructed by the terrain behind it. Curiously, the time of day in the sim appears to determine whether or not the portal displays correctly. When the sun is not not shining directly upon the portal (such as in the early morning), the portal appears as it should. However, when the sun is casting directly upon it, the entrance appears obstructed. Please see the attached screenshots, and note the sim time in each.


While this is admittedly not a game-breaking issue, I find it slightly irritating. Is anyone else experiencing anything similar?
My machine specs are as follows:
Operating System: Windows 8.1 64-bit (6.3, Build 9600) (9600.winblue_r9.150322-1500)
Language: English (Regional Setting: English)
Processor: Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz (8 CPUs), ~3.4GHz
Memory: 16384MB RAM
Available OS Memory: 16270MB RAM
Page File: 3001MB used, 29653MB available
Card name: NVIDIA GeForce GTX 660
Manufacturer: NVIDIA
Chip type: GeForce GTX 660
DAC type: Integrated RAMDAC
Device Type: Full Device
Device Key: Enum\PCI\VEN_10DE&DEV_1185&SUBSYS_098A10DE&REV_A1
Display Memory: 4035 MB
Dedicated Memory: 1475 MB
Shared Memory: 2560 MB
Thanks!