Blackboard Collaborate Only Works Half the Time

This week I am attending about six video conferences a day. Most are with Zoom, a few with Blackboard Collaborate. About nine out ten of the Zoom meetings work, but only about half the BB ones. Even when it does connect, there are problems with sound dropouts using BB. Also BB only seems to work for me with screen-sharing and audio. When it does work, BB is reasonably efficient requiring 70 Kbps download and 50 Kbps upload, which is better than Zoom without video. But I can't get video to work with BB at all. It may be that my wireless link is too slow, or too high latency, but whatever reason BB is not a viable product for me.