Given there are no posts about this, I'd imagine it's only me.
This happens when trying to export to SMD.

BST Version: 2.11.0b1 (github).
Blender 2.80 (5/27/2019 - Windows).

Blender Source Tools: exporting Collection
Traceback (most recent call last):
File "C:\Users\-------\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\io_scene_valvesource\export_smd.py", line 205, in execute
self.exportId(context, id)
File "C:\Users\-------\AppData\Roaming\Blender Foundation\Blender\2.80\scripts\addons\io_scene_valvesource\export_smd.py", line 309, in exportId
bpy.context.scene.update() # actually found a use for this!!
AttributeError: 'Scene' object has no attribute 'update'