Within the past couple of weeks, users of multiple Access databases have experienced instances of the Advanced Filter/Sort and Toggle Filter not working (greyed out). The forms have an underlying query and when you go into Advanced Filter/Sort, Access thinks you're in a query, not a filter. The query options are all available, but the filter options are not. We have experienced this across multiple databases, and restarting Access sometimes fixes the issue, and sometimes it doesn't. In fact, a user will be in the database in the morning working fine, and reopen the same database in the afternoon and lose the Advanced F/S functionality.
This seems to be a bug, but curious if anyone else has experienced it. The Advanced Filter/Sort is being open by macro from the form, and the underlying query appears correctly. No other changes have been made to the structure of the databases or data. Version of Access is 2510 (Build 19328.20178 Click-to-Run), Current Channel.