My particular instance of this problem occured such that all but two of our document library views, and all connected web part pages lost their view filters. Detailed data points below.
- SharePoint 2007
- Document Library based on an InfoPath 2007 form
- Document library was in a subsite
- 10k+ Items
- 20 views
- ~50 web part pages using out of the box library view web parts referencing the views
- All views but two were affected
- Thinking of it now, the two not affected, were not linked to web part pages.
- No other sites/sub sites/libraries seemed to have been affected by this 'hiccup'
- Filtering done on the webpart page via a query filter continued to operate as expected.
I would love to know what happened, or what could cause this in other instances.