Aaron just posted the following information to the Release 20.0 thread, and I want to make sure it is highlighted at the top of the forum. Please see the original thread for additional information:
Due to the reported issues of Bandwidth PLL Lock Lost errors on 450b with Release 20.0, we have decided to pull back the release from distribution while we investigate the issue. The issue presents itself as the 450b SM’s not reconnecting to the AP after they have been upgraded to 20.0. This appears to only be affecting systems with 450b SM’s, but we recommend not using 20.0until further notice.
If this issue happens, the 450b will likely need to be manually downgraded to an earlier release, as it is not something that is recovered via a reboot. It looks to only be affecting certain 450b SM’s, and we are investigating that as well, to see if we can find a correlation for affected devices.
If you have any devices experiencing this problem, please contact support.
To know if this issue is happening, on the SM GUI, you will see this message in Red at the top of every page:
Bandwidth PLL lock lost
Also, in the event log of the SM’s, you will see this message, indicating that the SM is not seeing any radio energy while scanning for the AP:
Radio not receiving any power.
Recovering radio that is not receiving any power.
We will be in touch as we ready an update to address this problem, and apologize for the inconvenience if you have been impacted by this issue as you used 20.0. We will also look at the other reported issues mentioned in this thread.