Three dots gives you a Hold. From the Help:

Rests, Shots, and Holds

"Breaks" (Rests, Shots, and Held Chords)

"Breaks" are points in a song when one or more of the instruments rests, plays a shot, or holds a chord.

Rests - You can specify any, some, or all instruments to rest at any bar. For example, you could rest all instruments except the bass for the first 4 bars, and then add in the piano for 4 bars, and then add in the entire band for the rest of the song. You may optionally disable the rests in the middle or final choruses (where people are likely taking solos, and rests are not appropriate).

Shots - You can specify certain instruments play a "shot," where the chord is played and then a rest follows. For example the song "Rock Around The Clock" has a shot on beat 1 followed by a rest for seven beats.

Held chords - You can specify that certain instruments hold a chord sustained for a certain number of bars. For example, you can have the bass and piano hold a chord sustained while the drums continue to play a pattern

A chord can be specified as a Rest by adding a period after the chord.

. indicates a C chord that is a Rest.

A chord can be specified as a Shot by adding two periods after the chord.

.. indicates a C chord that is a Shot.

A chord can be specified as a Held Chord by adding three periods after the chord.

... indicates a C chord that is a Held Chord.

Also, check that your tracks aren't frozen.

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