Just putting a quick post here, in case anyone's experienced similar issues.

I've recently picked up a new laptop (Mac OS "El Capitan" - not my choice, unfortunately, I'd have preferred to stick with Linux MINT), and it's having major issues reliably running the BOINC Manager software (v7.6.22).

I'm not crunching on the laptop, I'm purely using it control remote servers - however, although it can connect to them, it just sits there with the spinning-disk loading icon, and updates the screen about once every 30-45 seconds (in between updates the client itself is completely unresponsive), leaving the client pretty unusable. This only happens on the Tasks screen, and having "Show active tasks" or "Show all tasks" makes very little difference.

Have had a look at ~/Library/Application Support/BOINC/* and neither the stderrgui.txt nor stdoutgui.txt files have any log-entries in them (am assuming these are the correct ones).

Am still getting used to Mac OS, so I'm open to suggestions on other log-files to check or things to try, so I can get back to controlling my remote servers again.

EDIT: just to add, when the client is doing its "unresponsive" thing, load on the laptop doesn't spike up at all - the process in 'top' is in state "Sleeping" and is barely using 1% CPU.