Some OS X Mavericks users like me have been plagued with a problem sometime since the release of OS X 10.9 last fall: Our Macs won't wake from sleep and reconnect to the local Wi-Fi network. Apple says the problem is fixed in OS X 10.9.4. Has it been fixed for you?
OS X 10.9.4 has been in testing for weeks, first available to registered Apple developers in late May and more recently to customers who enrolled in the company's AppleSeed program, which provides pre-release software to a limited number of Mac users.
On Monday Apple posted 10.9.4 for the general public. According to the release notes, the update "fixes an issue that prevented some Macs from automatically connecting to known Wi-Fi networks" and "improves the reliability of waking from sleep."
Back in April I told you about a way I'd discovered to at least temporarily fix the problem. It involved blasting your Mac's Bluetooth prefs and starting over from scratch. Indeed, it did fix my problems, but they eventually returned after I'd started adding back in Bluetooth devices.
What was so maddening about it is that even after I removed the Bluetooth device profiles, the problem kept happening. Only taking the scorched earth approach — deleting that Bluetooth plist file in Mavericks' Preferences folder would do the trick.
Apple doesn't note any changes to Bluetooth in this release, and as usual, its release notes are vague enough that it's unclear what exactly was done to fix the Wi-Fi wake from sleep issue.
I've updated, of course, and I haven't seen the problem manifest itself. But it's only been a couple of hours, so it's really too soon to tell.
Now that the update is out in the world, I encourage you to download it and install it to see if it makes a difference. Then report back here and let me know.