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That's how I use the word, too. It's a Heisenbug, though only one that manifests itself when you try to present something.

A Heisenbug can be observed in many situations. The Vorführeffekt happens only in front of an audience.

I think I get what you're trying to say, but by definition an observation requires an audience, even if it's an audience of 1. Maybe say an increased audience size?

I think a "presenter" is required.

A sign that you may be beset by goblins bent on causing you mischief.

That's how I use the word, too. It's a Heisenbug.

Ok, but that doesn't make the translation any better. It's still wrong.

To all the oh-so-smart downvoters:

The translation is wrong because it makes things unnecessarily complicated. The term Vorführeffekt is used when something suddenly behaves differently in a not desired way when shown to others. The argument about double negation is logically right, yet entirely theoretical, as no sane person would ever describe or translate the effect in such a doubly-negated way to someone else.