Sensors not working after having a server time issue

Hi,

Recently I had an issue in time configuration of my PRTG server. The date jumped to the year 2028 causing my PRTG graphs to not working anymore. I fixed the date, and enabled "Recalculate graph now"; however since then all my sensors are in Unknown state. I checked core server logs, local probe logs, and Windows events, there is no error message. Then I saved probe states in two different time intervals, and couldn't find any anomaly.

In my Monitoring Database folder there are two subfolders named 20281217 and 20281218, and last modification date of most of the files in these subfolders are changed to 2028/12/17.

Even I installed a fresh copy of PRTG on a different server, and migrated all the data from the previous installation to the new server. The result was the same. Is there any solutions?!

Regards

PS: Here are core server and local probe server logs. If probe state logs are needed, please let me know.

Core Server log:

===========

12/28/2014 5:18:12 PM Startup: Starting webserver for IP 0.0.0.0:80 (URL: http://127.0.0.1)
12/28/2014 5:18:12 PM Startup: Loading Configuration File: C:\ProgramData\Paessler\PRTG Network Monitor\PRTG Configuration.dat
12/28/2014 5:18:18 PM Load Done
12/28/2014 5:18:18 PM Update 1
12/28/2014 5:18:18 PM Update 2
12/28/2014 5:18:18 PM Update 3
12/28/2014 5:18:18 PM LoadFromXML
12/28/2014 5:18:20 PM LoadFromXML Done
12/28/2014 5:18:20 PM Startup: Loading Configuration File: OK
12/28/2014 5:18:20 PM Startup: Objects: 5x probe, 9x group, 54x device, 358x sensor, 2x usergroup, 4x user, 3x notification, 8x schedule
12/28/2014 5:18:20 PM Startup: Sensors: 1x corestate, 9x dns, 1x esxserverhealthsensorextern, 1x esxserversensorextern, 23x http, 13x httpadvanced, 12x httpfull, 43x ping, 1x pop3, 1x port, 5x probestate, 9x remotedesktop, 1x smtp, 8x snmpciscosystemhealth, 3x snmpcpu, 8x snmpcustom, 9x snmpdiskfree, 154x snmptraffic, 7x snmpuptime, 1x sntp, 1x syslog, 5x systemstate, 12x vcenterserverextern, 6x wmidiskspace, 1x wmimemory, 20x wminetwork, 1x wmipagefile, 1x wmiprocessor, 1x wmiuptime
12/28/2014 5:18:20 PM Startup: Estimated Monitoring Requests Per Second: 6.047
12/28/2014 5:18:20 PM Startup: Init DataState
12/28/2014 5:18:22 PM Timing 0 : 2077
12/28/2014 5:18:22 PM Timing 1 : 93
12/28/2014 5:18:22 PM Timing 2 : 0
12/28/2014 5:18:22 PM Timing 3 : 0
12/28/2014 5:18:22 PM Timing 4 : 0
12/28/2014 5:18:22 PM Timing 5 : 0
12/28/2014 5:18:22 PM Timing 6 : 0
12/28/2014 5:18:22 PM Timing 7 : 16
12/28/2014 5:18:22 PM Timing 8 : 126
12/28/2014 5:18:22 PM Timing 9 : 0
12/28/2014 5:18:22 PM Startup: Init DataState Done
12/28/2014 5:18:22 PM Startup: System Memory: Committed: 87 MB, Allocated: 69 MB, Unused: 0 MB, Free Physical: 5154 MB, Total Physical: 6143 MB, Free Virtual: 3861 MB, Total Virtual: 4095 MBFree Pagefile: 6229 MB, Total Pagefile: 7167 MB
12/28/2014 5:18:22 PM Internet Explorer: V9
12/28/2014 5:18:22 PM Startup finished: PRTG Core Server Ready
12/28/2014 5:18:22 PM Proxy Configuration for Activation
12/28/2014 5:18:22 PM Not Using Proxy Server
12/28/2014 5:19:22 PM LogManagerCore: #2292 0.00 sec , SystemMain: #1032 2.89 sec , EventStorage: #580 0.00 sec , EventStorage: #2712 0.00 sec , LogManagerAutodiscovery: #3048 0.00 sec , LogManager: #3840 0.02 sec , NotificationManager: #1968 0.00 sec , FactoryManager: #3668 0.03 sec , LogManager: #3932 0.02 sec , RawDataManager: #1624 0.13 sec , BackgroundCalculator: #1564 3.88 sec , LibraryManager: #2384 0.00 sec , DataSynchronizer: #3892 0.03 sec , DependencyManager: #1656 0.00 sec , ScheduleManager: #3252 0.14 sec , BackgroundManager: #2200 0.03 sec , ProbeManager: #488 0.03 sec 
12/28/2014 5:19:22 PM Save Cache
12/28/2014 5:19:22 PM Save Cache done


Local Probe log:

===========

12/28/2014 4:32:32 PM Data Path: C:\ProgramData\Paessler\PRTG Network Monitor\
12/28/2014 4:32:32 PM System Path: C:\Program Files (x86)\PRTG Network Monitor\
12/28/2014 4:32:32 PM Running as Local Probe via 127.0.0.1
12/28/2014 4:32:32 PM Core Server Port: 23560
12/28/2014 4:32:32 PM SSL Enabled
12/28/2014 4:32:32 PM Probe GID: {A46E6533-25B7-4CA7-8549-5D666CBC2351}
12/28/2014 4:32:32 PM Init SNMP System OK
12/28/2014 4:32:37 PM Connected to 127.0.0.1:23560
12/28/2014 4:32:38 PM Connected
12/28/2014 4:32:43 PM Send Login
12/28/2014 4:32:43 PM Login OK: Welcome to PRTG

recalculate-graph time unknown-state