Comment 11 for bug 703542

After much digging, I believe the bug comes from the indicator processes shutting down themselves because the panel is not fast enough to connect to them. This can be workaround with two environment variables:

- INDICATOR_SERVICE_SHUTDOWN_TIMEOUT: the time before the process shutdown itself in milliseconds. Default value is 500 milliseconds, but the system multiplies it by two at startup.

- INDICATOR_ALLOW_NO_WATCHERS: if this environment variable is set the indicator processes won't shut down themselves automatically.

Can you try this?
- Create a file named /etc/X11/Xsession.d/72indicators-no-shutdown, with the following content:
export INDICATOR_ALLOW_NO_WATCHERS=1

- Restart your session and see if you still experience the bug.