i have a A2000 with 1meg chip and 8 meg fast ram
gvp ec030 acc. and vt2000 plus an 8up ram expander
I think you don't have enough chip ram. The Toaster is a serious hog here. My 4.2 version (with Flyer) takes over 800,000 bytes of chip ram just at the initial switcher screen. Depending on your Workbench screen mode, you might not have enough left to run the Toaster.
I'd also bet that your old version of the software took a bit less.