Can someone tell me where I can find the log file that is generated upon processing a dimension?
Usually the problem is coming when you have data into fact table with member from dimension which doesn't exist any more into that dimension.
You have to run a selection like that to check the intergrity of data from fact table:
select * from tblfact"nameofyourapplication" where "yourdimensionname" not in (select [id] from mbr"yourdimensionname" where calc = 'N')
if this selection return any rows then you have to delete these rows replacing select with delete.
Of course you have to do this verification for all dimensions from your application.