I have noted that quite a number of applications on my Al-book/10.4.2 are suddenly quitting. This happens maybe twice a day. I am not surprised when that happens with Word (v 11.2), but now it is happening with Keynote® (twice now in a Lecture), Safari, just happened in Canvas..... This is not the level of stability that I have been used to. Each time, there is this statement: Exception: EXC_BAD_ACCESS (0x0001) Codes: KERN_PROTECTION_FAILURE (0x0002) at 0x000000fb Can anyone help with the meaning of this? Any advice as to anything that I can do to fix it? I run Cocktail regularly. regards, Trevor