OK, quick update.

Still getting the API error, so I decided to do a full clean install on a different machine (on a workstation I use for CGI - it's never had Web Designer installed on it... I'd normally not use it, but I wanted to test as much as I could before giving up!). So, full clean install of WD11P (activated using my licence - I presume I can have it installed on different machines, never tried before!) and the exact same API error using my original Task Pilot log-in.

So, created a second Task Pilot account, and that failed to create api too, so, safe to assume it's an error at source?

Is there anyway to see/check on-line if there are issues affecting Task Pilot? That would have saved me a lot of time (rolling back Windows and checking to see if my original machine had any issues - then installing to a new machine etc).