Hi Matt,
I will answer your questions to the best of my ability, being a BIAB newbie and a computer novice in general.
I have a Lenova ThinkPad SL510 laptop, 5 years old running Windows 7Pro.
Single laptop screen
I do not know how to tell what video card I have. I assume my drivers are up to date. I check regularly.
I have BIAB 2015 + SuperPak, with the most recent build
I run MalWarebytes daily with no problems found.
I have arranged just two songs with BIAB. One is a waltz and the other the tango. I do not have the problem with the waltz, only with the tango. I can therefore assume I must have done something incorrectly with the tango? When I play the tango now at the end of the song it flickers for 5 seconds then starts to replay as it continues to flicker. It begins to play again while the screen is stuck flickering. About half of the times it freezes completely after a few seconds and will not replay.
I am using several styles, BOSAMEP, SONTRIO,SONMON2,SLOBOSA, and BOSSAGT. The problem occurs on all of the styles.
The only thing I did differently with the two songs is that I started with a MIDI file to get the melody and chords on the tango. When I arranged the waltz I did all of the notating by hand. I am experiencing the problem only with the tango. I have had this problem on and off ever since I began working on the tango. It occurs about 75% of the time. Sometimes it repeats just fine. Most times not.
I hope this provides you with enough information to generate some ideas as to what I must have done incorrectly when I imported the MIDI file to get my melody and bass lines (both treble and bass clefs).
With two of the styles, I used the Piano Roll function to delete the melody line, leaving me with just the bass line. I am having the same flickering problem regardless of whether I am playing the melody plus bass lines or just the bass line versions.
Thanks for your patience.

Larry