After upgrading to 4.8 (with FB1.54) I am getting an EIB_ISCError
exception when a key is pressed in any field while trying to update a
record:

ISC ERROR CODE: 335544569
ISC ERROR MESSAGE:
Dynamic SQL Error
SQL error code = -204
alias PATIENT conflicts with an alias in the same statement

PATIENT is the table name, I'm not using an alias. Insert works OK.
What should I be looking for?