There are definitely scenarios where I can think of just a 1 time file upload to the person I am communicating with and will never use the file again.

I can replicate this, including a serif font in the search-box. I have tested Open Sans font and currently not running a local instance of the Open Sans font.

See: http://goo.gl/XtsNpe

Appears that when using Ryver in (Safari) browser, it some what works with Safari.

Would definitely love to see full notification center integration in Mac Desktop version!

Definitely like the "Remind Me" request. However would like to suggest, perhaps similar to Slack, to make this a global command.

/remind [someone or #forum or #team] [text] [some description of time]