Premiere Elements 9 on what computer operating system? Have you updated 9.0 to 9.0.1? If not please do that from the online download and not with Help Menu/Updates within an opened project.
Premiere Elements 9.0/9.0.1
I have been able to get 1280 x 720 @ 59.94 or 60 progressive frames per second
Share/Computer/MPEG with Presets = 720p30 and then adjusting the frame rate under the Advanced Button/Video Tab of the preset.
Still trying to get 1080p60 instead of 1080p50.
Are you sure of your project settings?
If you are not dedicated to a MPEG2.meg 1080p60 file, how about 1080p60 (1920 x 1080 @ 59.94 progressive frames per second) as a Window Media Video 9.wmv file?
That you can set for....whereas, I can set for MPEG2 only as high as 720p60 (1280 x 720 @ 59.94 progressive frames per second).
with Presets = Cable Modem, DSL
Then under the Advanced Button/Video Tab customize that preset to your 1080p60 (1920 x 1080 @ 59.94 progressive frames per second).
I have the bitrate all the way up to 10,000 kbps (kilobits per second). Depending on the results, you could explore other lower choices.
We will be watching for your results as your schedule permits.