Sub-Folders Disappear Frequently in 2.1b2

[No]

Hello - I do not know if this is happening to others, I find that groups 
of sub-folders disappear after about 15 minutes of SM 2.1b2 is opened.

I have to shut down the browser and re-open in order for them to re-appear.
Any suggestions or something which I have to do in order to prevent this 
or is this a legit bug?

Thank you - Bo1953
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