Bisoux

Thats super weird but i have the same bug now !! with version 7 ! I have fresh install of windows 7 , so i will download version 6.1 and exe from 6.2 and will edit this post to confirm if its crashing, thats reallty strange, version 7 didnt work for me at all on winxp so there must be some serious bug somewhere in this version.
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ok I Can confirm, skin mode is completely broken in version7 , i didnt know cause version 7 crashed on my winxp machine and i installed win7 yesterday and just tried to open character which worked fine but now i see when i want to create character with skins then its crashing, so... download version 6.1 and then download exe from 6.2 :

 

you can download my raphael spriter project and see if it works for you, i dont do anything unusual , but its hard for me to pinpoint your problem cause i dont know what steps exactly  you do to make it crash, i import as skin, then add bone then i attach this skin to bone by parenting, and then i click twice on skin, so i can edit its vertices etc. when im finished with editing and adding dots/verts, then im clicking on skin twice again to apply verts so its saved properly in project.
His skeleton doesnt use multiple bones for one mesh tho but you cxan see if animating skin is making your spriter crash.
Skin mode works great for me on windows xp and win7 , i dont know why people have problems with it, it does crash sometimes but you have to make some weird undoing a lot to make it crash.I dont udo, try not undo at all if possible or if you have to then just one or two steps backwards.?Save a lot, save after adding each limb and finishing its setup.This is just good habit, its stupid and risky to create entire character and dont save at all until you start animating him, not just because of spriter but because of system and real life accidents, your windows might shut down or something else, just save a lot there's nothing against saving, i know in some softwares when you save you will lose undo history but spriter doesnt work like that which is great.If you're planning yo undo then save first.
raf.zip