Thank you, Luke-Jr, for 3.10.0!  Now my U1s and BEs will play well together on the same win7-64 i3 machine (after fiddling with the drivers) - I had to run them on separate machines until now.  But now there's a new issue.  My BEs (22), which have been running rock solid on (ahem) cgminer for several months, now all shut down between a half hour to an hour after a restart.  An S-B-Y restarts bfgminer which picks them all up again. The U1s (4) keep on trucking (except during the restart, of course). All of the miners are on powered hubs and are cooled by a fan.  Using the silas VCP driver. U1s running with clock:x0981 generating a fairly consistent ~1.9Ghs.

Is there a log I can look at that might indicate which might shed some light into this? I'm running the 64 bit bfgminer - should I try using the 32 bit version instead?  

Since the 4 U1s together run slightly faster than the 22 BEs, I will probably just add more U1s and put my BEs up for sale, but it is still an undesirable behavior...