The run-time system error COBRT252 "Memory corruption detected (Fatal)", might occur when performing a SORT FIELDS=COPY on a file with a record format of VB, under mainframe emulation of DFSORT.
If you create a multi-threaded application that uses CBL_EXIT_PROC to perform an exit procedure when the program terminates, and an error occurs during the exit procedure, the application does not terminate with a non-zero exit code to the operating system.
On IBM s/390, if you create a run-time system that includes a C module and you use the run-time system to run a COBOL shared object that calls a function within the C module, you will get an RTS 198 load error for that function when "." (dot) is included as a directory to be searched on the load library path (LD_LIBRARY_PATH).
On HP-UX, if a program attempts to delete a file that is already open to another user, the file status returned is 0/065 (File locked), instead of the more usual 9/029 (Attempt to delete open file). This applies to 32-bit files only: 64-bit files return the usual file status.