On Yosemite as well as windows 7 using 6.0a beta 1 and when following Jeremy Thompson's Blog on Case frames I get the "spinning beach ball" and must force cancel Logos. I am running a BWS using שׁוב from his example.
Does this work for anyone?
Thanks for the bug report. I can reproduce it and we have filed a case to fix it.
This should be fixed on 6.11 Beta 1.