Encrypted domino items (archived or non-archived) cannot be opened in Domino Web Access / iNotes, if the forms files (forms85.nsf for example) have been modified by Enterprise Vault (EVInstall.nsf)
This occurs only if the Domino ID password is different from the person internet password.
Trying to open encrypted emails (both archived or not) the error "A problem has occurred which may have caused the current operation to fail." is logged, this instead of asking the Domino ID password to decrypt the items.
Details about the error:
This issue occurs only when the person internet password and the Domino ID passwords are different.