we have finally found the problem that is causing this bug.
One driver that is needed for correct startup of MailShield (and also for correct operation of WebShield) is incorrectly installed. (on Win7 only)
It is caused by the aswclear ver. 6, that is unaware of the fact, that it has been renamed in Avast7 for Win7 OSs to aswrdr2.sys and leaves it there on the system, which again (and this is probably a bug) causes setup not to install it correctly next time.
We will fix it in the next build, for now, please use the following .reg file to import the missing settings into the registry. (please note, you will have to disable Avast Self-Defense features before the import and re-enable it after).
1) Go to settings/troubleshooting and uncheck "Enable Avast! Self-defense module"
2) Download the following link and open it - click on it. The message box appear informing you that this will change registry. Click Yes.http://public.avast.com/~rypacek/aswrdr/aswrdr-win7-installation-fix.reg
3) After successful registry import, you should see another message box confirming it. It it shows an error, probably you haven't gone through the step 1.
4) Re-enable avast! self defense, similary to step 1