Hey.

Not sure what I've done to create the issue. When I open my location layer in SCMDraft2 and locations come into view, the program crashes.

How do I fix this?

I've never heard of a concise fix for location-crashes in SCMDraft (it happens because it's getting old), here's things you can try:

1.) Try a backed-up version of your map (SCMDraft stores backups, go to Advanced->Open Backup Database, on the menu)
2.) Go into your SCMDraft folder and maps folder, delete backupDB.scmdDB, and all .tmp files; reopen SCMDraft
3.) Uninstall, download from here (in particular, not from anywhere else), and reinstall
4.) Save a backup (make a copy) of your map, then run String Repair Utility, may fix issues with bad strings on locations
5.) Open your map with this: Location Ripper, post the output file here, perhaps we will be able to figure out which feature of SCMDraft is broken
6.) Use CHKDraft - for editing your locations, using two editors is not ideal (as Chkdraft is still incomplete) but at least you'd be able to work with locations the same as in SCMDraft

Well ne ways... he pm'd me, StringRepairUtil fixed the problem in his case - lockable.