so testing on profile save (thanks for reminding about backups!)
any edits done on profile save, for weapons level/mayhem mods or unlock room customizations and characters customizations.
edit1: also crashes/corrupts for just opening and then saving with no changes made
crash the editor during save/save as
corrupt the profile.sav can cant reopen with this error.
Error parsing save:
Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: startIndex

here is debug text:
at System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource)
at System.BitConverter.ToInt32(Byte[] value, Int32 startIndex)
at IOTools.IOWrapper.ReadInt32() in J:\Coding Projecties\BL3SaveEditor\IOTools\IOWrapper.cs:line 399
at BL3Tools.BL3Tools.LoadFileFromDisk(String filePath, Platform platform, Boolean bBackup) in J:\Coding Projecties\BL3SaveEditor\BL3Tools\BL3Tools.cs:line 62
at BL3SaveEditor.MainWindow.OpenSave(String filePath, Platform platform) in J:\Coding Projecties\BL3SaveEditor\BL3SaveEditor\MainWindow.xaml.cs:line 337