My newly-installed TB disappeared from my Windows 8.1 64bit laptop. How can I prevent this happening again?

When I installed the new TB "portable" a few minutes ago, all seemed to be going well. I downloaded an accumulation of messages from my server and began setting up archive folders and filters. Suddenly, TB froze and then disappeared! When I clicked on the icon, I was presented with an empty, new, TB, and asked whether I wanted a new email address, etc, as I had been before (and refused). I've gone ahead and am downloading my messages into the "empty" TB, but how do I keep the content from disappearing again?
I wonder if this is a glitch associated with the evil Windows 8.1. Any ideas?
Thanks,
MaxineKL in Canada who much prefers Tbird to Outlook

The compatibility problem has been solved (the security setting needed to be changed to SSL/TLS, which changed the port to 995, and the message no longer appears. Thanks. Meanwhile, I am just hoping that content of TB doesn't up and disappear again without any warning or message. Have you any ideas about that problem?

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