I get frozen (stuck) when climbing the vine in Oktyabrya and the crab comes in to view to trigger the option of playing a music block. Of course I play one for the crab (whilst on the vine) but then afterwards I can't click, move off the vine. Just looks like I'm stuck in a climbing position. May also affect ladder climbing if crabs are in ladder locations.
I just refresh browser to continue playing though. No issues if I've already played music for the crab