I'd make the previous measure a 5/4 measure to add the extra beat (as opposed to adding a 1/4 measure after). Just a hunch for better results. It will likely regenerate for you better if you are generating any tracks, but you can try it both ways.

To do this I'd go to the Meter Map, use the INS button (insert) and change the time signature for the desired measure(s), then change the next measure back to the original time signature. see example below.

After doing this you'll need to regenerate any generated tracks like Realtracks or Realdrums (or MIDI) in order to hear any changes in generated tracks.

This being the case you may want to make use of the 'Save As' feature first, so you always have the original as an option to revert to later on.

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