ceastick, I wish I had a fast answer for you but the problem is your issue could be caused by a large number of reasons and we're not even sure if it is a problem with the software or something caused by your system setup. If we find a fix that looks promising, we will post an update but in the meantime here are some things you might try:
Make sure you run the jar with administrator permissions (could be that the app is requesting an index from your file system but doesn't have permission so it hangs).
Try putting the jar and the photo you want in the same directory.
Try putting the jar and/or the photo you want somewhere other than My Documents.
Re-download the jar (possible something got corrupted).
Try starting the jar from the command line.
Let us know if you have any success with these methods or if you have any more specifics about the problem. Rest assured we are keeping an eye on this and want to find a solution.
whenever i do "No max width" and "No max height" and use mcedit to put it in minecraft it always cuts off the top. i don't want to make it smaller because everything below 100 doesn't look very good is there any way to fix this?
The reason it is chopping off the top is because it's going past the max height of the level. You have a couple options:
1) Switch Spritecraft to "Side View" mode and place it horizontal in your Minecraft world instead of vertical.
2) Increase the max height of the level in MCEdit (not sure how to do this but I'm sure there is a way)
3) Instead of doing normal terrain in MCEdit, set the floor of the level to the bottom block, which will let you place graphics up to 127 blocks high. Usually the terrain starts in the middle, only giving you 64 blocks to go up.