Ok I was finally able to reproduce this, you have to saturate the game with buble so that it happens ! I had never tried that before ! Ok, I'll investigate... EDIT : what I found so far : - hard to reproduce, when I restarted a new game I was unable to reproduce this, even at stage 11 and even with fast bubbles I don't know what's needed exactly for this to happen but it seems quite hard to reproduce from scratch. - it's been there for a long time, even raine 0.60.1 had this already, and so it's not a recent change which produced this at least. Well I'll take another look later... EDIT 2 : well I found a work-around, a hack. Apparently you can saturate the cpus with bubbles and if they become too busy then the interrupts start to be on wait and to fill the stack, and since the stack is very small it can quickly crash everything. Now I would love to be able to reproduce this by myself to know if it's specific to raine, but I guess it is, and then find why, but I can't, without your save I can't saturate it enough to create the crash... ANYWAY ! The work around (dirty) is simply to add some cycles to the cpus when they become saturated, this way you won't see any slowdown in the game, and it will never crash ! I tried that with your save, it works perfectly. Of course the real hardware can't do that, so it's quite disturbing, but oh well... I think I'll keep this fix anyway ! EDIT 3 : after some more thinking I think I know why raine crashes here, it's because it doesn't handle the interrupt lines and so there can be many irqs waiting on the stack, which should never happen. So the best theoric fix would be to handle this interrupt line here, but it would be less fun, so I'll keep this work around for now : the game will never slow down anymore !!! (if you use git, the fix is committed, otherwise you'll have to wait for the next binary...).