bid explanation bubbles disappear

[cochrun]

While playing and learning on line with my partner against two robots after a few hands we can no longer see the bid explanations when hovering the cursor over an opponent's (robot's) bid. We have tried 4 different browsers with the same results. Sooner or later these helpful explanations go away. We generally play about 12 hands per session. The explanations disappear at random times but the capability never recovers during a session and they always are gone before we finish playing.