Opening a users Calendar

Can someone help… when any notes user to try to access a particular mailfile using the std mail6 design, to view a this users mailfile the calendar this opens up fine in the week view, but when they try and forward to the next week, they recieve either a “red box” uncorrectable error has occurred, or NSD crashes the Notes client and closes.I have replaced the Mailfile design, compacted,ran fixup,ECL settings but this still is causing problems. Any ideas?..

If I do this same in the users mailfile then this works a treat, I have also checked the calendar delegation and this allows everyone to read the problematic mailfile.

I have also noticed that if I do the same thing using a Notes admin group that this works fine.

the only strange concept is that an invidual user can open up ths mailfile, but can not forward to the next week as there client crashes with NSD.