It is a known problem of the CS 3.55, which is already fixed in CS 3.56. To start open your collection in CS 3.55 you should start it double clicking on the CollectionStudio icon instead of the double clicking on your collection file. Then, when CS starts without any collection, you can open your collection using "File Open
" command in the main menu.
Sorry, for inconvenience...
Hope we will release new version soon