Here is also the log when I search for an image:
[AFMPACS] Calling Application Title : "XRAY-1"
[AFMPACS] Called Application Title : "AFMPACS"
[AFMPACS] Application Context : "1.2.840.10008.3.1.1.1", PDU length: 64234
[AFMPACS] Number of Proposed Presentation Contexts: 6
[AFMPACS] Presentation Context 0 "1.2.840.10008.5.1.4.1.2.3.1" 1
[AFMPACS] Presentation Context 1 "1.2.840.10008.5.1.4.1.2.3.2" 1
[AFMPACS] Presentation Context 2 "1.2.840.10008.5.1.4.1.2.2.1" 1
[AFMPACS] Presentation Context 3 "1.2.840.10008.5.1.4.1.2.2.2" 1
[AFMPACS] Presentation Context 4 "1.2.840.10008.5.1.4.1.2.1.1" 1
[AFMPACS] Presentation Context 5 "1.2.840.10008.5.1.4.1.2.1.2" 1
[AFMPACS] Server Command := 0020
[AFMPACS] Message ID := 000b
[AFMPACS] (StudyRootQuery) search level: STUDY
[AFMPACS] Query On Study
[AFMPACS] Failed on VR Search: 0008 0080
[AFMPACS] (testing phase) - ignored
[AFMPACS] Failed on VR Search: 0008 1040
[AFMPACS] (testing phase) - ignored
[AFMPACS] Issue Query on Columns: DICOMStudies.StudyDate, DICOMStudies.StudyTime, DICOMStudies.AccessionN, DICOMStudies.StudyModal, DICOMStudies.ReferPhysi, DICOMStudies.StudyDescr, DICOMStudies.PatientNam, DICOMStudies.PatientID, DICOMStudies.PatientBir, DICOMStudies.PatientSex, DICOMStudies.StudyInsta, DICOMStudies.StudyID
[AFMPACS] Values: DICOMStudies.PatientID LIKE 'SLE%'
[AFMPACS] Tables: DICOMStudies
[AFMPACS] Sorting (DICOMStudies.PatientNam) DoSort := 1
[AFMPACS] Records = 1550
[AFMPACS] C-Find (StudyRoot) located 1550 records
[AFMPACS] UPACS THREAD 1300: ENDED AT: Thu Aug 25 15:19:53 2011
[AFMPACS] UPACS THREAD 1300: TOTAL RUNNING TIME: 0 SECONDS
[AFMPACS] User interface test: local server is running!
[AFMPACS] set normal log from GUI
But when I try to retrieve the image no log entry is happening. But after restarting the client it works again (sometimes) for a while.