Alerts and attachment blocking

Well, it does seem that our upgrade to ND6 has wrecked alerts for many of our users and the usual disable - reenable trick has no effect.  As I mentioned on April 9 checking the ($Alerts) folder is very helpful in troubleshooting; but I had to resort to deleting the folder to fix things.  I also found that doing a replace design to another template and then back to our custom template also changed the ($Alerts) folder enough to get it going again.  This is very troubleing and I'm wondering if I should automate the fix.  I would run it for everyone accept all current alerts are lost in the process.

Attachments - We use McAfee as our first line of email defense for viruses and a profanity list.  Today we added blocking of certain attachments as well.  Our CIO wanted to run this past upper management to get the go-ahead, but they agreed that there is no need for executable code to be sent to the average user.  So, if there is a legitimate business need for these files, they must be zipped or renamed prior to sending.  We now block files with these extensions: VBS, EML, SHS, JS, PIF, SCR, VB, CMD, CHM, BAT, COM, and EXE.