To me everything seems OK: no crash or freeze with fast reverse, both with transitions and without. It seems to me (but it's not sure because I didn't keep yesterday's data) that the reverse and fast reverse are slightly slower than yesterday's release. I tested with X11 and OpenGL; with vdpau; vaapi and none (I have an AMD graphic card now); with perpetual session and without. There are slight differences in performance but nothing important. PS: I apologize for wasting your time with "perpetual session" and "move/swap up/down": yesterday I had compiled without deleting the .bcast5. So the traces of the sessions before the compilation were left. Today, by compiling and deleting the .bcast5, I didn't have any more strange sentences in the terminal. PPS: I attach "installation.tex" because I made a very small modification