If a measure is left blank, the player skips over it. This is non-intuitive behaviour:

(1) It departs from the standard convention of lead sheets, in which a blank measure is always understood to mean that the last specified chord is continued. An app whose screen looks so much like a lead sheet should follow that convention.

(2) For a measure to be present in the chord chart and be skipped over in playback is very bizarre behaviour.

I assume there were technical reasons for choosing this non-standard behaviour. But iReal Pro in most other respects makes the experience easy and logical for the musician user. I'm sure it would not be all that difficult for your developers to bring the treatment of a blank measure into conformity with the familiar standard. The logic is simple: "If a measure is blank, repeat the last specified chord." The repeat-measure symbol would remain valid for those who want to use it.