frame rate error, After FX 5 and V-dub help please

[dancray]

I hve an avi file that shows 29.97fps when I run in virtual dub; and when I place some titling on it in After Effects (keeping the same frame rate and then render it)...and then attempt to re-append it in virtual dub with part of the original file...virtual dub refuses to append saying that the "streams" are not the same. But when I check the file rates they show that they are the same rate...

what is happening? how can make this work...is there something funny in After effects?

thanks