Failed to open find or create Sandbox directory

I am trying out AppSync with with VMware thinapp 4.6.1 and I am running into the above error when I try to update the package.  I can install both the older version of firefox and the newer version via the .msi.  When the program goes the AppSyncURL it updates the package, but on restart it throws the error:

"Failed to open, find, or create Sandbox directory"

Here is my AppSync Parameters:

Firefox 3.6.19

Firefox 5.0.1

;-------- AppSync Parameters ----------

;AppSyncURL=https://example.com/some/path/PackageName.exe

AppSyncURL=http://mypage/~gregorcy/downloads/thinapps/Mozilla-Firefox-Global/bin/firefox.exe

;AppSyncUpdateFrequency=1d

;AppSyncExpirePeriod=30d

;AppSyncWarningPeriod=5d

;AppSyncWarningFrequency=1d

;AppSyncWarningMessage=This application will become unavailable for use in %remaining_days% day(s) if it cannot contact its update server. Check your network connection to ensure uninterrupted service.

;AppSyncExpireMessage=This application has been unable to contact its update server for %expire_days% day(s), so it is unavailable for use. Check your network connection and try again.

AppSyncUpdatedMessage=Movin On Up!

;AppSyncClearSandboxOnUpdate=0

Any help would be very apprecaited.

Thanks,

--Brian