MS Query has abruptly become "uneditable". We have several queries that were created in-house that connect to a Pervasive DB. We have been running these queries for years, and simply change the date to get the information we need per month. Until recently when we opened the queries through Microsoft Query, we had the tables displayed at the top and were able to make changes. Now we no longer have the tables with their links visible, additionally under Table menu Add / Remove / Join Tables are greyed out. The Show / Hide Tables, and Show / Hide Criteria buttons are visible and clickable but do not do anything. If we recreate queries all works properly and is displayed / editable. Any suggestions how to revert queries or potential causes?