I am currently using the free version with WordPress 3.8.1. I have come across two problems:
Error: Syntax error, unrecognized expression: ?page=sp-emails
When I deactivate Sendpress and empty my browser cache, everything works again.
2. the button for creating a new e-mail is missing. this occured after updating to Sendpress 0.9.9.4
Thanks in advance for your help