locking and table corruption problems

I have Paradox 8 and BDE patch 5.1.1 My problem is that two or more different users from differt PC can acces to same record and modify it wihtout any lock. Almost always this corrupts indexes and headers requiring a rebuild. Now we can work only one at time....and it is almast tragedy in office.... Same .net directory path for all users. Local share true or false seems not affect even since we all use only paradox. Looking in directory I noted that .lck file are not creatred anymore. Oldest one is few months ago. I'm not sure this can affect but this could be the reason. I excpected to find in same directory where tables are.....and expected paradox to give an error message if there is not .lck file or could not create it. Please help since company is "down" ! Thanks, Dean

You say, "Same .net directory path for all users."   Did you check it with the BDE admin utility?

Are you sure the users' Paradoxes are using the correct configuration file?

Do you get an error when you start the user's Paradox?

The network lock file may be corrupted.  Go to the .net directory and delete the file "PDOXUSRS.NET".  (The first Paradox to start will re-create this file.)

-Al.

Thanks for answer Al.

The updated my situation is following :

- I reinstalled paradox and BDE 5.11 

- form BDE tool i confirm that all .net are the same even the case

- i deletetd all .net and .lck files

- local share is set to true

- i managed to disable oplocks on all pc-s

- imanaged to disable write caching on pc without raid controller

- i'm not able to remove write caching on server (i think  most important) that has raid controller NVIDIA ....if you know some hints i would appraciate a lot

After this things goes better but not complteley ok. 

- paradox creates again lck files and locks records

- there is not refresh for changes made from another user unless you close or F5 lock again record

- in few hours no more corruption but only two users ...on monday more relevant test

So if you have ideas or know how to remove wrtie caching with raid thanks a lot,

Dean