Julius Bahle’s book Eingebung und Tat im musikalischen Schaffen: ein Beitrag zur Psychologie der Entwicklungs- und Schaffengesetze schöpferischer Menschen is published in Leipzig. In the book, that eminent scientist and author of fundamental research on the creative process in music quotes Koffler’s statement:
I always associate melodic lines in my own and other music with the sense of physical movement. My first Symphony, Op. 11, began with the slow movement, which came to my mind quite clearly while climbing stairs, and which to me constitutes (!) an expression of heavy, strongly constrained but at the same time powerful upward movement.
Pianist Fryderyk Portnoj successfully performs Variations sur une valse de Johann Strauss, Op. 23 at a recital held in the Polish Music Society hall. This marks the first performance of this composition in Lwów. The program pairs Koffler's work with Maurice Ravel's Alborada del grazioso and George Gershwin's Rhapsody in Blue. In his review, Aldred Plohn (Chwila) writes:
Koffler treats the theme, taken from the well-known 'Emperor Waltz,' with admirable lightness and finesse, demonstrating not only his masterful command of compositional technique but also his great creative abilities, inventiveness, and skill in handling the chosen theme in a consistently original and fascinating manner.
A composition by Koffler, whose title remains unknown, is performed at a concert organized by the Society of Music Lovers in Lwów's Municipal Casino.
World War II breaks out. Germany’s attack against Poland on 1 September is followed by Soviet Union’s invasion from the east on 17 September. From 22 September, Lwów is under Soviet occupation.
Following the capture of Lwów by the Red Army, education in the city is reorganised. PTM Conservatoire is closed. Koffler takes over the chair of composition at the Faculty of Composition in the newly established Lvov State Conservatory (Львовская государственная консерватория, LGK, operating in the PTM Conservatoire building), in which the post of director is given to the Ukrainian composer-pianist Vasyl Barvinsky. Zofia Lissa becomes dean of the Faculty of Composition, and Róża Koffler takes up the post of piano teacher.
The Supreme Qualifying Committee in Moscow grants Koffler the title of professor. The USSR Ministry of Culture appoints Koffler to the positions of LGK deputy rector and chair of composition. His duties include management of research work and the teaching process.