Time travel. It’s such a promising stage subject, why haven’t playwrights tackled it more? A chance to compare and contrast eras and attitudes, to explore the progress we’ve made and what we’ve lost. Debra Whitfield’s little comedy Tech Support attempts all of the above, throwing in some #MeToo concerns and pointed observations about our inability to keep up with the galloping pace of technological change. It’s a friendly, well-meaning effort. And it’s frustratingly low-impact.