I have tried the same workflow and could not reproduce the issues.
Firstly, I created a blank Project of dimensions 1014 x 723 and then inserted few slides.
Then Inserted few text captions and text animations into the project and published it as .F4V file.
When I uploaded this video to youtube, I got a warning "We see inconsistencies in the aspect ratios in your uploaded video file....." (Are you getting the same warning?)
After uploading the video, I played the video in HD and I was able to read the text captions and text animations text. What font size have you set for captions? (Is it possible to share the youtube video link?)
Secondly, I published the same project in F4V format with fixed frame rate and played it in Adobe Media Player. The text animations was playing properly. (Have I missed any step here?)
many thanks. I'll send you a PM with a few links :-)
thanks mate, didn't see the icon.... :-)