* Docker.app sometimes uses 200% CPU after macOS wakes up from sleep mode. The issue is being investigated. The workaround is to restart Docker.app

* There are a number of issues with the performance of directories bind-mounted with `osxfs`.  In particular, writes of small blocks, and traversals of large directories are currently slow.  Additionally, containers that perform large numbers of directory operations, such as repeated scans of large directory trees, may suffer from poor performance. For more information and workarounds, see [Known Issues](/manuals/desktop/troubleshoot-and-support/troubleshoot/known-issues.md) in [Logs and Troubleshooting](/manuals/desktop/troubleshoot-and-support/troubleshoot/_index.md).

* Under some unhandled error conditions, `inotify` event delivery can fail and become permanently disabled. The workaround is to restart Docker.app

### Beta 20 Release Notes (2016-07-19 1.12.0-rc4-beta20)

**Bug fixes and minor changes**

* Fixed `docker.sock` permission issues
* Don't check for update when the settings panel opens
* Removed obsolete DNS workaround
* Use the secondary DNS server in more circumstances
* Limit the number of concurrent port forwards to avoid running out of resources
* Store the database as a "bare" git repo to avoid corruption problems

**Known issues**

*  `Docker.app` sometimes uses 200% CPU after macOS wakes up from sleep mode. The issue is being investigated. The workaround is to restart Docker for Mac (`Docker.app`).

### Beta 19 Release Notes (2016-07-14 1.12.0-rc4-beta19)

**New**

* Added privacy tab in settings
* Allow the definition of HTTP proxy overrides in the UI

**Upgrades**

* Docker 1.12.0 RC4
* Docker Compose 1.8.0 RC2
* Docker Machine 0.8.0 RC2
* Linux kernel 4.4.15

**Bug fixes and minor changes**

* Filesystem sharing permissions can only be configured in the UI (no more `/Mac` in moby)
* `com.docker.osx.xhyve.hyperkit`: increased max number of fds to 10240
* Improved Moby syslog facilities
* Improved file-sharing tab
* `com.docker.slirp`: included the DNS TCP fallback fix, required when UDP responses are truncated
* `docker build/events/logs/stats...` won't leak when iterrupted with Ctrl-C

**Known issues**

* See [Known Issues](/manuals/desktop/troubleshoot-and-support/troubleshoot/known-issues.md).

### Beta 18.1 Release Notes (2016-07-07 1.12.0-rc3-beta18.1)

> [!NOTE]
>
> Docker 1.12.0 RC3 release introduces a backward incompatible change from RC2. You can fix this by recreating or updating your containers.

**Hotfix**

* Fixed issue resulting in error "Hijack is incompatible with use of CloseNotifier", reverts previous fix for `Ctrl-C` during build.

**New**

* New host/container file sharing UI
* `/Mac` bind mount prefix is deprecated and will be removed soon

**Upgrades**

* Docker 1.12.0 RC3

**Bug fixes and minor changes**

* VPNKit: Improved scalability as number of network connections increases
* The docker API proxy was failing to deal with some 1.12 features, such as health check.

**Known issues**

* See [Known Issues](/manuals/desktop/troubleshoot-and-support/troubleshoot/known-issues.md).

### Beta 18 Release Notes (2016-07-06 1.12.0-rc3-beta18)

**New**

* New host/container file sharing UI
* `/Mac` bind mount prefix is deprecated and will be removed soon

**Upgrades**

* Docker 1.12.0 RC3

**Bug fixes and minor changes**

* VPNKit: Improved scalability as number of network connections increases
* Interrupting a `docker build` with Ctrl-C will actually stop the build
* The docker API proxy was failing to deal with some 1.12 features, such as health check.

**Known issues**

* See [Known Issues](/manuals/desktop/troubleshoot-and-support/troubleshoot/known-issues.md).

### Beta 17 Release Notes (2016-06-29 1.12.0-rc2-beta17)

**Upgrades**

* Linux kernel 4.4.14, AUFS 20160627

**Bug fixes and minor changes**

* Documentation moved to [/desktop/mac/](../_index.md)
* Allow non-admin users to launch the app for the first time (using admin creds)
* Prompt non-admin users for admin password when needed in Preferences