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I'm on 5.11, but I've seen this on 5.10, as well.
1) Create a new Single-View app.
2) Open storyboard in designer.
3) Lovingly and painstakingly craft a complicated UI with a bunch of constraints.
4) Select a widget, and click it to switch to constraints mode.
5) Click the "x" to the right of "CONSTRAINTS" in the designer ("Remove existing constraints").
The constraints go away, and the widget remains.
Randomly: BOOM. Widget gone.
I know, Heisenbug. I hope this repros and can be tracked down.
=== Xamarin Studio ===
Version 5.11 (build 370)
Installation UUID: f3d0b2e3-dec8-4dc1-b784-31a84b3761e0
Mono 4.0.4 ((detached/d481017)
GTK+ 2.24.23 (Raleigh theme)
Package version: 400040004
=== Xamarin.Profiler ===
=== Apple Developer Tools ===
Xcode 7.1 (9079)
=== Xamarin.Android ===
Version: 126.96.36.199 (Business Edition)
Android SDK: /Users/mikenorman/Library/Developer/Xamarin/android-sdk-macosx
Supported Android versions:
2.3 (API level 10)
4.0.3 (API level 15)
4.4 (API level 19)
5.0 (API level 21)
SDK Tools Version: 24.4.1
SDK Platform Tools Version: 23.0.1
SDK Build Tools Version: 23.0.1
Java SDK: /usr
java version "1.7.0_71"
Java(TM) SE Runtime Environment (build 1.7.0_71-b14)
Java HotSpot(TM) 64-Bit Server VM (build 24.71-b01, mixed mode)
=== Xamarin Android Player ===
Location: /Applications/Xamarin Android Player.app
=== Xamarin.Mac ===
Version: 188.8.131.52 (Business Edition)
=== Xamarin.iOS ===
Version: 184.108.40.206 (Business Edition)
Build date: 2015-10-28 19:11:03-0400
=== Build Information ===
Release ID: 511000370
Git revision: 26b6ce0654a631b0570f26bcb219a934c45bc120
Build date: 2015-10-28 18:49:17-04
Xamarin addins: c0849c38118d8a4b23cdb72213df40044a8581b1
Build lane: monodevelop-mdaddins-master
=== Operating System ===
Mac OS X 10.10.5
Darwin Mikes-MBP 14.5.0 Darwin Kernel Version 14.5.0
Wed Jul 29 02:26:53 PDT 2015
When this issue happens can you attach the log files from XS in case there's anything interesting there?
From your description i don't think this is a duplicate of bug 35641. However i wouldn't mind if you can double check with the latest master builds because the fix for bug 35641 landed and if it makes this problem go away, that'd be great!
I'm unable to repro on the latest RC. I'll leave it to you, Alan, to mark it Not Repro if you think we're out of the woods.
If we don't have a solid repro for this then it's as likely to be bug 35641 as it is anything else. That bug would've made it look like widgets were vanishing when you closed a storyboard and re-opened it.
We'll just close this as a dupe unless more information surfaces showing it's actually something else.
*** This bug has been marked as a duplicate of bug 35641 ***