Windows Phone Mango users reporting disappearing keyboards

This is one for the "hasn't happened to me (yet), knock on wood" files.

A number of Windows Phone users who have upgraded to the "Mango" operating system release are reporting their soft keyboards are disappearing intermittently.

WMPowerUser.com noted last week that there seem to be a number of random problems surfacing among users who have upgraded to Mango, of which disappearing keyboards is one. The disapparing-keyboard issue doesn't seem to be tied to specific phone form factors. In other words, some HTC Trophy 7 users are reporting the disappearing keyboard issue, while other Trophy users are not.

WMPowerUser reported on October 12 that on the XDA-Developers.com Forums, "a number of users are complaining of either the keyboard not popping up when the user touches an input field, and even worse, disappearing in the middle of typing a sentence."

The @WindowsPhoneSupport account on Twitter noted on October 14 that Microsoft Support is aware of the disappearing keyboard issue. I asked Microsoft officials for information on how and when Microsoft plans to fix this -- or at least what they're advising users who are affected to do to alleviate the issue.

"Customer support is working with the individuals reporting changes to their experience. We are investigating these reports to determine the root cause of any issues users are having," said a Microsoft spokesperson via e-mail at the end of the day (ET) on October 17.

I'm hearing from a growing number of Mango users via e-mail that the disappearing keyboard issue has hit them. Anyone else out there? Any other newly introduced problems you've seen since upgrading to Mango?

(Thanks to @aharpaz for persistence in reporting this issue.)