Filter Forge crashes after update

I updated to the latest version of Filter Forge 2 (after getting a message that I had to do that for a filter to work) and since then, it's been crashing my PSCS3 regularly when I open the filter from within PS, making me lose unsaved work a couple of times

Although I've not used Filter Forge for a couple of months, I had no problems whatsoever before.

Any ideas? Thank you much for your help.

MacOS: 10.5.8
PS: CS3
Filter Forge: 2.009 Pro Edition, Release-10.5, 13 January 2011.

Edit: sorry, the thread title is not entirely correct. It's my PSCS3 that crashes when opening Filter Forge.