Just tried it, works great! thanks webbot.
Found another AVR studio "feature" when upgrading from webbotlib 1.14 to 1.15 - In the project configuration I had to remove the webbotlib includes and libs and compile, then re-add and re-compile for it to pick up the new symbols. Was quite a strange one as it did find the include the files but then said it couldn't find identifiers where those includes included other webbotlib includes i.e. it was a compilation rather than linker error.
Anyway, good luck with the new version folks!