Thank you Bernie and Keith for your answers :-) - I've downloaded the various releases, but not yet installed.

I guess on the one hand I'd like to use and keep up with the latest versions and make some nice pictures with them; on the other I don't want the version I have, which works fine even though it has its limitations, overwritten by a version which will break my existing saved files, and then not be comptible with UF.

Wouldn't it be better to call the program by a different name if it's going to end up being so far from version 2, or a standalone, so that the old and new versions can both be installed without interfering with each other, and also call the ucls different names, too?

For me backwards compatabillty of formulas that are being updated in the database is paramount. It would be better if formulas that have been greatly changed should be released with a different name to avoid this issue.

Tina

aartika! fractal art by Tina Oloyede :  http://www.aartika.co.uk