I used to use version 4.9 and now jumped to 6.04. I am heavy user of exporting files with pstex and I used to mark the bits which were supposed to get texed by "special". The button changed to "latex", and either I don't understand how it works or it does the wrong thing. It deleted the \ symbols when exporting and I could not make it do what I wanted. I went back to version 5.04, which works again.