As I've been implementing all the helpful advice members have been providing, I suddenly received an error message when attempting to filter:

And it's not just this schedule; filtering no longer works in any of my schedules. In fact, the filter button has even been removed from the menu bar.
I had this happen once before, and the only solution I had was to redirect to a previously saved database (I am using a SQLlite database). Fortunately I recently saved my entire database, and I export the XER schedule often. (Although, I should be doing an XML export)
So I'm not devestated, just set back an hour or so.
Has this happened to anyone else?
thats basically my reply
There is an article on Oracle's Support that might cover this issue. Doc Id. 2145705.1
thats a good idea
Thanks for the suggestions. They didn't solve the issue, so I redirected to my previously saved database. I'm going to make a practice of copying / archiving it each night just in case this ever happens again.
Thanks for the suggestions. They didn't solve the issue, so I redirected to my previously saved database. I'm going to make a practice of copying / archiving it each night just in case this ever happens again.
its definetly a layout issue