Requisite search fails

Hi,

we are on Requisite 3.5/88

after updating the catalogue from a flat txt-file (which we do on a regularly base each week) the ordinary search does not work at all - even when putting in SAP material nr the search fails. Still the material is in the catalogue and can be found via product index. we did not change any settings - this is the first time ever we face such a misbehaviour...

help very much appreciated,

matthias kasig