One of the updates is that it should be detecting the correct permissions to use, but it seems like that isn't working right. The permissions are now set in the database in the WA_Settings table.
In the previous version it always used 0777 for folders and 0644 for files. The new version could use 0755 for both if it detects issues with using 0777. I've opened up an incident to look into this with you. I'm interested to see why it might have failed on your server.... you can probably just update it in the wa_settings table to fix it, but I'm still curious to see why it didn't set it correctly in the first place.
Please update your incident with a good phone number and time to call and we will look into this with you and make sure it is resolved and ideally make sure nobody else runs into the same problem in the future.