KbWait/Check not working

KbWait has stopped working on my Macs (MacPro, MacAir). The symptom is that the call never returns. Keypresses are echoed in the Matlab window, but the call doesn't return. The difference seems to be Matlab version. It fails in R2014a but works in, e.g., R2012b. I assume it isn't about OSX version (the R2014a machines are 10.7 and 10.8; the R2012b machine is 10.7. Any ideas? Please cc me on any posting to my email address below.

Michael Landy
landy@...