Unfortunately, the current ViceX is still a bit buggy. It crashes a lot when mp3 playback option is turned on (actually it always crashes in that 'mode' with me after several games played).
Also when having put a game in NTSC mode, the emu crashes the Xbox after 2 or so games.
All this has been reported to Madmab, and he`ll check it out when he`s got some time for it.
Don`t know for sure about the save-states, but it could be that it has to to with the same issue: playing a game for a while and doning something within the emulator and crash.
Does it occur with more games?
There is also the issue, when a game which has several disks (like the Ultima series) , and your loading in a Savestate which, say you saved when playing on disk 1 and loading it in when playing on disk 2, Vice doesn't recognize it (also mentioned

).
Which screenmode is your ViceX running? (for me ; putting it in 720*576 mode; crashed the emu immediately)
Thanks for the reply asphodel. I see from other posts that you are as big a fan of C64 as I am, so Im glad to hear your imput.
As far as games using several disks, I've tried it several ways. I even played the game until it asked for disk 2 (2 is the disk that the save was on) then I tried to load the saved game and still same result. Keep in mind that it works well when I save it only with a few minutes of play but when I play for a little while it'll save fine but freezes when I load the save state.
I havent been able tell if it happens on other games yet. But it have happened to bot versions of ultima I tried.
Changed everything back to 640x480 last month. Too many bugs in 720p mode.
Can someone please try to duplicate the problem and maybe together we can find a solution