UserAgent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36

Steps to reproduce the problem:
1. certain signatures source code causes this, not pin pointed yet
2. set a signature
3. spell check stops working

What is the expected behavior?
spell check should work when sending emails.

What went wrong?
Spell check should work with the emails, and when certain signature source code is removed, spell check resumes. The signatures are not always special, with links, or other special features. Even simple signatures can cause this. When picking apart the signatures, removing certain lines will cause spell check to work again. Not sure what would cause this but have encountered multiple times this week already, and always the same culprit. The signature. Also, spell check will still work outside of sending emails, but something about the signature is causing it to stop working when sending an email.

Did this work before? Yes current version

Chrome version: 54.0.2840.71  Channel: n/a
OS Version: 10.0
Flash Version: Shockwave Flash 23.0 r0

this can be fixed by adjusting the signature, but people should be allowed to keep their desired signature without sacrificing spell check. Not sure why those would be connected but after multiple encounters, I am sure it is the culprit.