Anything I can do to fix this?

I recently retiled it with the SCMDraft "Map Dimensions" editor, and it hasn't worked since.. is there anything I can do to check what the issue is?

Well, it would be a lot easier to help you fix you map if you told us more about the map in question. Map dimensions, tileset, etc.
Or you could just post the map up and let some people look at it and get back to you.

http://www.staredit.net/wiki/Crashlist

Nice map. I can see why it crashes.

Oh wait... What map? Post it, or post the error message (hex value) and I can tell you why it crashes.

Thanks for this!

I found out the problem, it seems the default size when I opened the map dimensions editor was 124x124, which was invalid.. simple fix, just changed it to 128x128.