larry,
Firstly, I didn't know that the Team had released a build 278. The last build I was aware of was 268. I will have to check on that.
Anyway, if the version you have now in place works, then I would leave things alone until the Avast Team can look into the "broken chain" problem. If the problem is with the download, then it will only reoccur, or YES, it might affect the working version you have right now.
Other users have reported this, but I am not sure at this moment what the Team is doing about it.
Sorry I could not offer more information at this point.
