While in the IDE, I added the solution to the repository and then checked it out and updated it, as expected. Now, I get no interaction from the add-in. It acts as if the solution has not been added.
But when I navigate to the physical directory, I see all the tortoise options. I can manage the solution ther just as you'd expect. TortoiseSVN 1.5.5, Build 14361 VisualSVN 1.5.4 Thanks.

