I'm using the 3.3 demo on XP

When debugging, I can't get breakpoints to do anything.
When I set "breakpoint on script start" to off in the debugger,
it just goes to the end of the script, ignoring my breakpoints.

There doesn't seem to be anyway to step through breakpoints,
once I'm debugging, and the run to cursor only works intermitently.
I'm left with stepping line by line which realy sucks.

Other than this problem, the program is great.

You did a wrong thing.
Do never set off "breakpoint on script start" in the dbglistener settings.
It is a crucial thing.
If you do not want IDE to stop on the first line, set off "Stop on the first line after run", see tools->settings->Debugger tab.

I only set "breakpoint on script start" after trying numurous other things.
When I change the setting as described in tools->settings->Debugger,
my breakpoints are ignored, and the script is run to it's end. I'm debugging remotely by the way...

Do you start debug session from inside the IDE ?
Have you created a project ?

I start it from IE, and I have created a project.

It works fine debugging line by line starting at the first this way, and if I put in DebugBreak() and turn off start @ 1'st line in IDE it breaks there,
but the points I set in the IDE are ignored still

You'd start from the IDE if you want it to set breakpoints.

All breakpoints are stored in the IDE, not on the server and therefore there is no other way to have them set other than running from the IDE.