I just tested both things with my campaign, and I can add sighting aids; beware they're not fully automated yet but should show up in your inventory. Same with encumbrance, working just fine.
Just looking at that screenshot, do you have any Themes/Extensions loaded? Mostly 'cause the charsheet shouldn't look like this if you have the standard theme loaded. Maybe that is causing the error?
This is what it looks by default: Attachment 51202
You can also see several attachments, and encumbrance working just fine.

