There seems to be a known bug in AllChars 4.0.321 when used together with Internet Explorer 9 (my default browser).
While AllChars is running, I can't use Internet Explorer or open the manual from the AllChars menu. In both cases I get an error and a WerFault.exe process starts consuming a lot of CPU (about 50%).
I tried these hints to disable starting WerFault.exe, but it didn't help.
Any ideas how I can use this tool in a safe way?