Yes status 2 is a "File I/O error", but it's strange because file that have this error continue to work with some index but not all.
For example, a client table work with the id : you enter the client's id and the request return the good client but when i display the list of client order by client's name, there are some line which are blank then i test the file and i've got the error 2 :s
Since my last message, i've the problem again on some files where no insert/update are done, just reading.

I've actived trace try to see anything abnormal but the log file is not easy to understand. Is there any software which can read pervasive trace file (to know what operation, at what time, on what file, is done ..)