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We study experimentally the response of a dense sediment of Brownianparticles to self-propulsion. We observe that the ergodic supercooled liquidrelaxation is monotonically enhanced by activity. By contrast the nonergodicglass shows an order of magnitude slowdown at low activities with respect topassive case, followed by fluidization at higher activities. Our resultscontrast with theoretical predictions of the ergodic approach to glasstransition summing up to a shift of the glass line. We propose thatnonmonotonicity is due to competing effects of activity: (i) extra energy thathelps breaking cages (ii) directionality that hinders cage exploration. We callit "Deadlock from the Emergence of Active Directionality" (DEAD). It suggestsfurther theoretical works should include thermal motion.

Active glass: ergodicity breaking dramatically affects response to self-propulsion