Can't find my reply from yesterday - sent from my mobile, so re-answering just to be sure:
What usually happens is that I double-click on the sparse bundle,and it looks like it is going to open, but then nothing happens. I am able to open sparsebundles from other macs which use the same TC, and which are also in the "shared" folder.
I once got up the fktimecapsule, and some errormessage, but cannot remember what it said I am afraid. I was trying various approaches suggested in different user-pages, but was tired, and tried many different things, so I am not sure what exactly happened. The message was something in the direction of "illegal command" or "no access"or similar.
We probably need to start retrying various approaches in a more controlled manner?
I'll be online most of my pm, which is probably your am.
This is almost embarassing, but believe it or not - now it's working! To try to recreate the error message, I sat down and rebooted all systems, set up an ethernet cable and had the patience to try to open only the iMacs sparse bundle. Went off to dinner, and voila- came back and there the backups were!
So,sorry to cheat you of the good feeling of helping, but the process was helpfull in any case!
Have a great evening!