If the page you're using BugHerd on has a Content Security Policy (CSP), you'll need to add a few domains in order for the sidebar to appear.
You need the below policy configuration:
script-src:
'unsafe-inline'
*.bugherd.com
*.pusher.com
img-src:
*.bugherd.com
d2iiunr5ws5ch1.cloudfront.net
bugherd-attachments.s3.amazonaws.com
*.bugherd.com data:
connect-src
*.pusher.com
sessions.bugsnag.com
*.bugherd.com
frame-src:
*.bugherd.com
If you need any further help on this, feel free to contact us on support@bugherd.com.