Have you tried:
– deactivating all plugins to see if this resolves the problem? If this works, re-activate the plugins one by one until you find the problematic plugin(s).
– switching to the 2012 theme to rule out any theme-specific problems?
– resetting the plugins folder by FTP or phpMyAdmin? Sometimes, an apparently inactive plugin can still cause problems.
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Thanks Christine, I will give this a go and post the results.
I’m currently having the same issue. I’ve deactivated all plugins, even renamed the plugins folder in ftp, switched to the 2012 theme; yet, every time I add a text widget (with content or not) and refresh it just disappears.