I've created filters to move specific messages to specific folders. The filter has been working fine for the past year, but just recently, they were all not displayed in the Mail Filters tab in Options. The filters are still there, coz when I try to recreate the filter, an error message pops up saying that the filter already exists.

Here's the screen shot of my problem:

What's going on here?

I'm running ZCS NPE 4.5.0.