online 5.02 problem

Hi! I am a new Informix user. I've followed the install instructions and have successfully installed the engine and associated products. I can navigate around the environment OK as user 'informix'. But when I log on as someone else and sitting in another directory, I am not able to run any of the ONLINE programs (ie., dbaccess, tbmonitor, etc.,). The error I get is: 529: Cannot attach to shared memory. 155: ISAM error: Primary and Mirror chunks are bad It also brings the engine down. The online logfile has these following messages: 16:05:20 -- Online Aborting -- us=c1797120, pid=21265, uid=571 16:05:20 Checkpoint Page Write Error 16:05:20 INFORMIX-OnLine entering ABORT mode!!! 16:05:20 -- Online Aborting -- us=c1797120, pid=21265, uid=571 16:05:20 Cannot Open Primary Chunk 'rootdbs', errno = 2 16:05:22 INFORMIX-OnLine Stopped I do have the same environment variables set in the .profile file for both logins. The search PATHs are also the same in both places. I hope this is enough information for some one to give me some hint as to where the trouble could be. Thanks