You could try the following things to find out what causes the crash.
1. go to the Library (do not start gli) and try searching and browsing
your collections one by one to find out which collection causes the crash.
2. remove the collection you have been working on to a temporary directory
and try creating a new collection in gli without modifying anything just
drop in a couple of html files. You can find your collection at
GSDLHOME/collect, where GSDLHOME is where Greenstone was installed.