[Radiant] Site 5 errors

[keith]

All,
 
Sorry to spam you guys this weekend!
 
So, after tears and hours of heartache I think I might have spotted where I
am going wrong. I have set up radiant 6 on site 5 accounts (the missing
instructions I needed pertain to setting up gem settings in .bash_profile.
The problems occur when I import from a database - or at least it looks that
way - can anyone tell me if this should cause a problem??
 
When I do so I get the 500 Apache Application error in /admin when trying to
view a page.
 
Thanks,
Keith