Is everyone experiencing the no texture glass issue or just a few people? --- Post updated --- Its a problem on your end. Fix it.
It's probably an outdated or conflicting mod. Disable all of them, and reactivate them one by one until you find the issue.
When the left signal is on, both signals light up, and when the right signal is on, nothing lights up.
Sorry it's only your fault then, probably over 100 of them are outdated and break the game, good luck finding which ones