Setting Tempo not actually setting the right tempo
1) press the new score button
2) add an instrument (doesn't matter which one)
3) click next
4) click tempo
5) set dotted quarter note equal to anything (I'm using 135 for this example)
6) create the score
the program correctly engraves in your score that a dotted quarter note equals 135, however, when played back or on the right of the playback, you can see that a non-dotted quarter note equals 135. Meaning you have to delete the correct tempo marking so you can put it back in again for the tempo to work correctly.
Attached is a SS of a new score created with dotted quarter note = 135 and the playback at quarter note equals 135.
Note: it doesn't have to be in 6/8, bug also happens in 4/4. Haven't tested any other time signatures