>>We have an index that keep corrupting all the time. Even if I delete the table, rebuild it from scratch and recreate the indexes, the same index will eventually corrupt itself again. Allways the same index and allways the same table.
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>>Except for power failure or application shutdown in a middle of a write, what can cause this ? And how to avoid it ?
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>I don't know if this has already been suggested, but I've seen cases where bad characters in table data (e.g. CHR( 0 )) can cause index corruption. These are sometimes caused by power failures or app/workstation crashes as you've mentioned but they persist in the table data, so they cause problems with indexes.
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>You may want to scan the table(s) in question (char and memo columns) for CHR( 0 ) or other characters that shouldn't be there.
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>If you're deleting the table, the backup you're restoring or APPENDing from may have this sort of corruption.

I've done a scan of the table for any CHR (0) in any string fields and didn't found a thing. All the numeric and date fields seem OK also.