It seems like the first recommendation by Graphisoft tech support is to clean your preference files per this Graphisoft technote. So, several months ago I created a batch file for Windows XP that will delete the preference files automatically, plus I also added a few commands to it that will also cleanup other Windows temporary files. All of the PCs in my office run this file at login so we will never have a possibility of corrupt preference file which are known to cause problems with ArchiCAD. I'm making this available to everyone in the hopes that it might be useful, but it is offered with no warranty whatsoever. You can download the batch file here on the Downloads page.

I'll try to make one for Mac OS X in the near future.

Below are the contents of the file just to illustrate what happens:

REM This batch file is courtest of GetStandardized.com, Featuring the Standardized Template System for ArchiCAD
REM and is provided with no warranty whatsoever.

REM This line deletes files from the current user's default temp folder
rd /s/q "%USERPROFILE%\LOCAL SETTINGS\Temp"


REM This line deletes files from the user's ArchiCAD cache folder
rd /s /q "%USERPROFILE%\Local Settings\Application Data\Graphisoft"

REM This line deletes files from the user's ArchiCAD cache folder
del /f /q "%USERPROFILE%\Application Data\Graphisoft\*.prf"
del /f /q "%USERPROFILE%\Application Data\Graphisoft\*.xml"


REM These lines delete Windows temp stuff
rd %temp% /s /q
md %temp%
rd /s /q "%USERPROFILE%\Local Settings\Temp"
md "%USERPROFILE%\Local Settings\Temp"