El Capitan Mail Preview Pane issue

It in Dutch. But choose the mailbox than go to the top of screen and choose Mailbox, one of the lower options is, Rebuild the mailbox.

I wish I found this thread last night. Hereis what I did to solve the problem: While in classic mode, simply try Mail>File>New Viewer Window. The pane unlocked in the new window. Hope that works for others. Jay

Hi:

NONE of the solutions worked for me. Not rebuilding, Not a new viewer window, not rebooting. Nada.

The little dot at the bottom turns into the Bar with an upArrow above it, but it will pull up at all

I am on a 13" MBP 5,5 running ElCapitan.

Other ideas?

Same here. Nothing has worked for me thus far. In fact, when I click on rebuild mailbox Mail just totally crashes. Hope they get this fixed soon. Judging by the amount of posts out there on this topic, we are not alone.

Redsfan: wondering if those of us who can't fix it are those that have been, um, neglectful and have huge inboxes? I'd fess up how large mine is, but I just told a friend and got grief for it. (22,000 - I don't think it's THAT many.. i just deleted 10% and remembered why it's so large.. it takes too long to go through and delete. I think it took me an hour..) -swim

Anyone know if this view "should work" NOT in Classic mode. I was able to resurrect the preview pane working in Classic mode, but it disappears again when I uncheck Classic in preferences.

I had the same problem. None of the proposed fixes worked.

Then I found the following advice in an Apple Developer forum:

You can diagnose if this being caused by an issue with one of Mail's resource files by forcing Mail to rebuild them (this has nothing to do with rebuilding a mailbox). Quit Mail and move the following folder to the desktop (you can press shift+cmd+G from Finder and copy-paste if you need to):

~/Library/Containers/com.apple.mail

Restart your Mac. Open Mail again and, hopefully, the issue won't reoccur.

I tried this method, and it worked for me. Perhaps it will work for you.

Jay Yoo, thanks for that. Opening up a New Viewer Window is a lot easier than rebuild/reboot. I opened a new window (which displays correctly) and closed the old one. Back to work!

EDIT: I spoke too soon. It worked for a minute, now back to blank previews again.

Followup: Yes, this method works--but it also wipes out any subsidiary mailboxes you may have added (say, for a particular client). Clearly getting rid of these container files gets rid of something that triggers this bug--but it's impossible to know exactly what. I've reported the bug to Apple Care.

I found that this is apparently a feature, not a bug. You don't have to rebuild Mail or restart the computer. Just click on the dot at the bottom center of the window to get the drag symbol; click and hold while you slide it up toward the top of the content window. **When you get the near the top,** the preview pane will suddenly appear again. I tried several times till I discovered I wasn't dragging the mouse/finger up far enough. I had to get almost to the very top. After that you can drag the content window up and down again to resize as desired.

Thanks, Arshay! You've saved me a huge amount of extra work and trouble.

I skipped all the reboot and rebuild, and just dragged the little dot with the half arrow more than halfway up, and poof, I had my preview pane back. You do not get any visual feedback that it is working until you drag at least half way up. You have to just do it.

Rebuilt, restarted, can't pull pane up at all.

Did you keep dragging up *without letting go*? You need to keep dragging till you're halfway up (thereabouts) the window, when the Content pane suddenly appears. There is no visual as you drag up; you just have to trust it and keep going ;-) No need to rebuild Mail or restart. This appears to be the way it works now.