In need of insight Background For years we have moved patches across out 3000 machines by 1- Installing patches on our development machine 2- Creating a SLT tape. And a store tape with files from all the HP accounts eg. Sys Telesup etc. 3- Updating production machines with the SLT and restoring files (minus files that are unique to each machine eg. nmconfig , log files,logdcc,command .... 4- HP endorsed this method and it has worked without incident until now 5- HP told us the above method would be valid in updating from 5.0 to 5.5 Problem Last week we updated a production machine to 5.5 using the above method. We were looking good; system came up; background jobs were running and then our batch took off. Two executables aborted with a Data Memory Protection Trap. Both these executables run to completion on the development machine that is running 5.5 (where the SLT and accompanying files come from). We backdated the production machine to 5.0 and the executables ran to completion. To Summarize; a executable runs to completion on a 987 running 5.5 and this same executable has a DMPT on a 996 running 5.5. Are there some machine differences or is the method of updating no longer valid with 5.5. Is Virtual Space Management different on a 987 vs a 996 Thanks Howard Schelin [log in to unmask] phone 305-376-3026 fax 305 376 3388