Client Version vs DB version vs Client OS Version
If I try to go from a 10g client on Windows 7 64 bit machine to a 10g database, I am successfull.
If I go from a 9i client on WinXP-32 to the 10g via the same front end app as in line 1, I am successfull.
Yes I am on the trailing edge of technology for the database but I am near the bleeding edge on out maintenance management app. The combo helps my level of stress and sanity.