Yes it happens when facing directly towards the sun. Ya just have to take off the filter and shoot like that. Just be careful about flying rocks and stupid P.A's
I had the same problem with an otherwise decent Hoya filter on my DVX. I have found that the B+W F-Pro MRC filters to work much better for me. The difference mainly has to do with the optical coatings.
-Dan
When light hits the lens at "that certain angle" you're going to have a flare no matter what brand of filter you use. Multicoating may help the "internal light bounce factor", but your best bet is to flag the lens. Some kicks will show up as a streak;some as an overall lowering of contrast, depending on aperture and focal length...the French flag, is your friend.
Hope this helps.
Ken
the Screen Skins guy