I am a long-time patron and just upgraded to the Mega Powerpack for a lifetime license.
I have the same issue after upgrading my Dropbox App to the latest version, where the Dropbox sync folder is placed at `~/Library/CloudStorage/Dropbox`.
I have tested the search function in Spotlight and it works as expected, but Alfred fails to find any content located in the Dropbox folder.
I fixed this issue by resetting the Search Scope to `Applications and Home` as shown in the attached figure.
It seems it is a internal bug in Alfred rather than a indexing issue.
Although I solve this issue via a comprised solution, it leads to a poor performance as Alfred will search all contents under the directory `~/`.
I am wondering will the Alfred team solve this problem in a near future?