Just use either the "fill right or fill left effect". I don't have access to 5.5 at the moment so I can't offer any advice as to why it's doing what it's doing because cs6 works slightly different than cs5.5 in certain ways. However using the fill effects will solve the problem.
However I just had a thought after you used the "mono as stereo" modify feature, did you deselect the channel that didn't actually have audio in it? So in this case you would want to deselect the right channel since it's the one that doesn't have any audio. Like in this video
Thanks much for your quick response! You nailed it, and the video tutorial was great. Strangely the Adobe "manual" does not mention either the "fill" option, nor de-selecting the channel without audio.
I have formatted my one-track [clip] to play Mono As Stereo.
Why, that happens by default anyway?
Ok, here's the rub; my sequence plays just fine, but out of sync as I mentioned I used a DSLR to record video and recorded sound with a separate recorder. I'm trying to use Pluraleyes to sync picture and sound. After running the Pluraleyes rather complicated sequence the synced clip comes back with only the LEFT channel playing audio.
Frustrating. I don't suppose you have any experience with that application...
I've been reading Pluraleyes is buggy with 5.5
Many thanks again,
I'm new to Premiere, (from fcp), and possibly there is a setting I'm missing, but I had to manually change the mono clips to play the audio in both L and R channels. If there's a default I'd love to know about it.
OK for starters, if there's a left channel, then there must by definition also be a right channel, whether or not there's anything on it is irrelevant. It's there, and so it's not mono. Mono has only one channel. That's the meaning of the prefix "mono" - one.
So, you have a stereo audio track with audio on one side. You fix that using the Fill Left effect, either on the clip, or at the track level.