For some reason Caroldoll the back to back issues are really a problem. Not just for the shore excursion selection but in the whole new system. We have been required to book each cruise separately as the system could not handle a back to back. YESTERDAY I had a back to back in 2010 come through as one booking. It may have been working earlier I had just not had a booking that made me realise that was fixed. This was 2010 and 2009 may be a different issue.
Does not help your plight just thought I would tell you that it is not just a shore excursion issue.

It is so far away from your cruise I would not worry, although I am sure you would like to complete the task and it is fun to decide what you are going to do. On these boards it appears everyone is on top of things but really the passengers on the boards are a very small percentage of the overall ship and very few are thinking about shore excursions for September at this point or even realise that an onboard booking system is even available.

There are "board people" that are very well informed and then "regular people" who are not aware of anything new that has happened since their last cruise.