than when your blog theme suddenly disappears and you are pushed back to the default.
My customised Tarski theme just disappeared and was replaced with the default theme! I swear, I didn’t do anything. For the time being I have replaced it with the simplest theme from the other options. Tarski is still there, but maybe a new version was uploaded or something. Anyway, don’t have time to fiddle about with it now.
Very, very irritating!!