Returning from all contributions of a contact to all contributions at all? a bug?
If you examine the link to view all contributions from the bottom of the contributions tab, it actually takes you away from the contact record and directs you to the contribution search, with your search parameters (namely, the contact ID) prepopulated.  Once you're done viewing the contribution, you get taken back to the contribution search page (without your previous search parameters, alas).  I would agree that it's not as user-friendly as it could be, but I wouldn't classify this as a bug per se.  One workaround might be to open up the contribution info in a new tab, which will leave your contact's contribution search intact.

Lesley