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Never had this much problem before using Pinnacle. *ugh*
You are dragging the transitions to between two video clips with audio. Right? You may be trying to put the transition at the exact center like you did with pinnacle and that is wrong. You need to apply the transition between the video portion of the clips only and not on the center or audio portion between two clips.
The next time you see the no symbol then move and drag the transition up about ¼ inch until the no symbol disappears before you release the mouse button.
You may need to expand the timeline ruler so you can see the transition and where you are dropping it. There should be no gap between clips for normal transitions to work.
Let us know if this helps.