I just switched from CS4 to CS6. I've always edited my sony HDV (Mt2) 30p files natively in an HDV 1080p30 sequence without a problem in CS4. No rendering require. In CS6 however, when I import the files they show up as 29.97i UFF...and when I drop them into an HDV 1080p30 sequence I get told that the footage does not match the sequence setting, if I leave the sequence setting as is, the lovely red render line shows up above the footage (still plays back smoothly). If I change the sequence settings to match the footage, I'm now working in an HDV 29.97i UFF sequence. I work on a television show that delivers in 30p (29.97 progressive). Should I be worried or just go with the 29.97i UFF sequence?
Are you using PC or MAC? If you're using a PC please download media info and check the field order info by dragging your video file into media info. Then set it to "tree view" it will tell you if it's interlaced or progressive. This way you can check for sure which it is. Although if you know you recorded in HDV 30p it shouldn't be having any issues What type of camera did you shoot the video with?
(Although media info can't properly detect most PsF footage either)
However several sony HDV camera's record 30p content as "Progressive Segmented Frame" also called PsF. A lot of times when PsF footage is imported it reads as UFF even though it's actually PsF which contains both fields of information. The way to work with this type of footage is to right click the footage inside your bin then click "modify">interpet footage> then seclect conform field order to Progressive (No Fields) then once this is done you edit in a progressive timeline. Here is a article that explains the work flow. It also shows you how to perform this workflow properly in Premiere.
(Basically all the main camera makers currently sell cameras that record content as PsF so even if you didn't use a Sony camera there is a good chance your footage is PsF.)
I really recommend reading the rest of these ProVideo articles. It explains exactly why the issue occurs in depth etc. It also shows the fix for FCP too, since it can't properly read PsF either.
When dealing with PsF the editing software see it as interlaced because it's actually progressive video stored in a interlaced stream. This type of footage causes confusion for obvious reasons.
Yes several camera's that don't use tape record as PsF which is stored in a interlaced stream, however if it showed up as progressive in cs4 then I'd suggest checking the field order in another program like the one I mentioned above. Because it is indeed possible that something strange is going on here. However as far as I know the specific cam model you mentioned records as true progressive. But I'd suggest you check the footage's field order using media info or another simlilar program.