>> two errors :
>>
>> Database: H:\MI4\MI4_2.FDB
>> Index 1 is corrupt on page 53072 level 1. File: ..\..\..\src\jrd\validation.cpp, line: 1648
>> in table ACC$PREDOC (134)
>>
>> Database: H:\MI4\MI4_2.FDB
>> Index 1 has orphan child page at page 51974 in table ACC$PREDOC (133)
>
> Index ID and relation ID

Different IDs for table ACC$PREDOC (133 and 134) look very suspicious
to me. May be the author often drop and recreate the table?..

SY, SD.