Informix memory errors, 'serial' number errors

Hi: We have a DEC 433 MP with 3 CPU's, running SCO ODT 2.0 (which has Unix 3.2.4) and Informix Online 5.0, Informix 4GL 4.1. We have been experiencing some problems with a production 4GL program that servers about 50 users at the same time on this machine. Are there any known problems if 4gl v4.1 is used with Online 5.0 ??? If so, could you please describe what kind of troubles may arise. One of the errors we have is -408 that means "Invalid message type received from the sqlexec process" Another error we have is -1113 which means "Memory allocation error", we are not sure if this means a lack of shared memory, physical memory (i.e. real memory) or virtual memory. The last two may not be the case since we have 64 MB of RAM and 4 GB of diskspace, the swap space is 65 MB. The shared memory part of informix is configured for 60 users and indicates a total of 1.6MB. The MAX shared mem size in the kernel configuration is 3.1MB and 512 4K shared memory segments. I'd like to know opinions on this particular problem since we are not too much involved with informix internals and there is the suspicion of a memory fault (hardware), any ideas ??? On other issues, has any of you experienced problems with the 'serial' data type on Informix. It seems to us that the supposed 'serial', never repeating; incremental numbers are not working properly, they DO repeat. Has this happened to someone else ? Please tell your story and how you solved it. The configuration is the same described above. Please, post your responses to this newsgroup of either mail them to me to ak132@cleveland.freenet.edu Thanks and best regards. Felipe