The title of my mail pretty much says it all.
If you have a Gig instrument and it crashes GS every time you try and load it... chances are that one of the audio files which makes up your instrument has looping turned on and has a number in one of the boxes which is greater than the actual length of your sample. To rectify the problem turn looping off and on again, remembering the message which GS gives you. Then set the incorrect number to a value lesser than that stated in the message.

It worked for me.