Are you saying that PDF Explorer terminate by itself without showing any error message?! yes its correctly
If I understand you say that this occur when you use the DBSearch scan mode to search in the indexed contents.
If yes, this behavior occurs with any search expression? yes
From that search, how many file results you get? 736
If you enable the “WholeWordsOnly” option, you get the same problem? its a good idea - as yet stable
Are all these 20.000 PDF files contents indexed in the PDFE database? yes, its my archiv stand by today
I never tested with so many indexed contents so I’m not sure if this can be, or not, the problem.
For metadata indexation 20.000 files is nothing to PDFE but for indexed contents I have no numbers. If possible email me your PDFE database files. Just create a backup of your database (Database>Backup...) and attach it to an email message. sorry, its to privat - and to big by approximately over 100000 sites
Sincerely
hermann