I can't record with Audacity 2.1.3

Since I downloaded the new version of audacity 2.1.3 I can not record.
When I press the record button,a red arrow appears at the beginning of the track and recording can not be performed. And I can not find a way to unlock it

Check your settings in the device toolbar.
If you still have problems, tell us what you are trying to record and what equipment you are using.

Also see this FAQ: http://manual.audacityteam.org/man/faq_recording_troubleshooting.html#pauses.