As of this morning I can't get Duplicate Cleaner to load. Have checked Event Viewer and am getting the following -
Fault bucket 1802321322, type 5
Event Name: CLR20r3
Response: Not available
Cab Id: 0
Problem signature:
P1: duplicatecleaner.exe
P2: 2.0.0.5
P3: 4d826eaf
P4: DuplicateCleaner
P5: 2.0.0.5
P6: 4d826eaf
P7: 696
P8: ec
P9: System.InvalidOperationException
P10:
Attached files:
C:\Users\David\AppData\Local\Temp\WER83CF.tmp.WERInternalMetadata.xml
These files may be available here:
C:\Users\David\AppData\Local\Microsoft\Windows\WER\ReportArchive\AppCrash_duplicatecleaner_179b26b520f2ab769c614847aad0b7a154d374b2_1942d75b
Analysis symbol:
Rechecking for solution: 0
Report Id: 48312ca8-56d5-11e0-87ad-ffd46a94d54c
Report Status: 0
Hmm -
Dave
Startup Failure (v2.04 & v2.05) on Windows 7 x64
TextCrawler also does the same - Just installed Windows 7 x64 SP1 last week if that helps - going to have a poke around the .net assemblies
Fault bucket , type 0
Event Name: CLR20r3
Response: Not available
Cab Id: 0
Problem signature:
P1: textcrawler.exe
P2: 2.1.4055.19513
P3: 4d4fce86
P4: TextCrawler
P5: 2.1.4055.19513
P6: 4d4fce86
P7: 3b4
P8: f2
P9: System.InvalidOperationException
P10:
Attached files:
C:\Users\David\AppData\Local\Temp\WERC1E1.tmp.WERInternalMetadata.xml
These files may be available here:
C:\Users\David\AppData\Local\Microsoft\Windows\WER\ReportArchive\AppCrash_textcrawler.exe_16e025d1e7cba813b899c65c72d88ce0306019ff_09fdc902
Analysis symbol:
Rechecking for solution: 0
Report Id: 889f5d94-5b08-11e0-bfa5-001fd056a462
Report Status: 1
Fault bucket , type 0
Event Name: CLR20r3
Response: Not available
Cab Id: 0
Problem signature:
P1: textcrawler.exe
P2: 2.1.4055.19513
P3: 4d4fce86
P4: TextCrawler
P5: 2.1.4055.19513
P6: 4d4fce86
P7: 3b4
P8: f2
P9: System.InvalidOperationException
P10:
Attached files:
C:\Users\David\AppData\Local\Temp\WERC1E1.tmp.WERInternalMetadata.xml
These files may be available here:
C:\Users\David\AppData\Local\Microsoft\Windows\WER\ReportArchive\AppCrash_textcrawler.exe_16e025d1e7cba813b899c65c72d88ce0306019ff_09fdc902
Analysis symbol:
Rechecking for solution: 0
Report Id: 889f5d94-5b08-11e0-bfa5-001fd056a462
Report Status: 1
Fixed it 
was still having problems - decided to run the application using the microsoft debugger (mdbg.exe) to try and get a more meaningful error - it produced this useful output...
mdbg> run duplicatecleaner.exe
STOP: Unhandled Exception thrown
Exception=System.InvalidOperationException
_className=<null>
_exceptionMethod=<null>
_exceptionMethodString=<null>
_message="An error occurred creating the form. See Exception.InnerException for details. The error is: Font 'Ar
ial' does not support style 'Regular'."
_data=<null>
_innerException=System.ArgumentException
_helpURL=<null>
_stackTrace=array [192]
_stackTraceString=<null>
_remoteStackTraceString=<null>
_remoteStackIndex=0
_dynamicMethods=<null>
_HResult=-2146233079
_source=<null>
_xptrs=0
_xcode=-532459699
This is unhandled exception, continuing will end the process
IP: 247 @ ♣.☻.☻ - MAPPING_EXACT
[p#:0, t#:0] mdbg>
Aha - so somehow, i'd managed to delete/disable/break/etc the Arial Regular font on my machine - restored it from the internet and Duplicate Cleaner is now working
Just passing on the information if it's useful to anyone else

was still having problems - decided to run the application using the microsoft debugger (mdbg.exe) to try and get a more meaningful error - it produced this useful output...
mdbg> run duplicatecleaner.exe
STOP: Unhandled Exception thrown
Exception=System.InvalidOperationException
_className=<null>
_exceptionMethod=<null>
_exceptionMethodString=<null>
_message="An error occurred creating the form. See Exception.InnerException for details. The error is: Font 'Ar
ial' does not support style 'Regular'."
_data=<null>
_innerException=System.ArgumentException
_helpURL=<null>
_stackTrace=array [192]
_stackTraceString=<null>
_remoteStackTraceString=<null>
_remoteStackIndex=0
_dynamicMethods=<null>
_HResult=-2146233079
_source=<null>
_xptrs=0
_xcode=-532459699
This is unhandled exception, continuing will end the process
IP: 247 @ ♣.☻.☻ - MAPPING_EXACT
[p#:0, t#:0] mdbg>
Aha - so somehow, i'd managed to delete/disable/break/etc the Arial Regular font on my machine - restored it from the internet and Duplicate Cleaner is now working
Just passing on the information if it's useful to anyone else
A few ways I can think of ...
Options (the 3rd menu item)
Next to the last item is the (Select language...) option.
When the dialog opens, find English.
---
(Backup then) delete, DuplicateCleaner.settings.
---
Exit DC.
Edit DuplicateCleaner.settings with a text editor.
Find the tag that says, <Language>
Change it to say: <Language>English</Language>
Save & exit.
Options (the 3rd menu item)
Next to the last item is the (Select language...) option.
When the dialog opens, find English.
---
(Backup then) delete, DuplicateCleaner.settings.
---
Exit DC.
Edit DuplicateCleaner.settings with a text editor.
Find the tag that says, <Language>
Change it to say: <Language>English</Language>
Save & exit.