Here is Blocs for Mac V5.2 beta build 8 with more fixes and improvements 
This version also has some new controls for the horizontal scroll containers that let you customise the control colours and appearance.
Have fun testing and have a great weekend! 
Hi,
unfortunately the same error when adding e.g. the “Volt Blog” Bric:
Exception Name: NSRangeException
Description: *** -[__NSArrayM objectAtIndex:]: index 9223372036854775807 beyond bounds [0 .. 10]
User Info: (null)
0 CoreFoundation 0x00007ff8034defa6 __exceptionPreprocess + 242
1 libobjc.A.dylib 0x00007ff802fd4231 objc_exception_throw + 48
2 CoreFoundation 0x00007ff80340fb13 -[NSTaggedPointerString hash] + 0
3 Blocs 0x0000000108f1c84d Blocs + 1783885
4 Blocs 0x0000000108dfd96a Blocs + 608618
5 CoreFoundation 0x00007ff803461800 __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 137
6 CoreFoundation 0x00007ff8034f2336 ___CFXRegistrationPost_block_invoke + 88
7 CoreFoundation 0x00007ff8034f2280 _CFXRegistrationPost + 532
8 CoreFoundation 0x00007ff8034316fb _CFXNotificationPost + 682
9 Foundation 0x00007ff8043b122e -[NSNotificationCenter postNotificationName:object:userInfo:] + 82
10 Blocs 0x0000000108f85126 Blocs + 2212134
11 AppKit 0x00007ff806c67360 -[NSApplication(NSResponder) sendAction:to:from:] + 337
12 AppKit 0x00007ff806c671d3 -[NSControl sendAction:to:] + 86
13 AppKit 0x00007ff806c67105 __26-[NSCell _sendActionFrom:]_block_invoke + 131
14 AppKit 0x00007ff806c6700e -[NSCell _sendActionFrom:] + 171
15 AppKit 0x00007ff806c66f56 -[NSButtonCell _sendActionFrom:] + 96
16 AppKit 0x00007ff806c63e7e NSControlTrackMouse + 1823
17 AppKit 0x00007ff806c6373b -[NSCell trackMouse:inRect:ofView:untilMouseUp:] + 125
18 AppKit 0x00007ff806c63602 -[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] + 666
19 AppKit 0x00007ff806c629f8 -[NSControl mouseDown:] + 666
20 AppKit 0x00007ff806c6139d -[NSWindow(NSEventRouting) _handleMouseDownEvent:isDelayedEvent:] + 4580
21 AppKit 0x00007ff806bd9fca -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] + 404
22 AppKit 0x00007ff806bd9c1b -[NSWindow(NSEventRouting) sendEvent:] + 345
23 AppKit 0x00007ff80736c5f6 -[NSApplication(NSEventRouting) sendEvent:] + 346
24 Blocs 0x0000000108fa7d28 Blocs + 2354472
25 AppKit 0x00007ff806f2d0df -[NSApplication _handleEvent:] + 65
26 AppKit 0x00007ff806a6be1f -[NSApplication run] + 640
27 AppKit 0x00007ff806a3fe10 NSApplicationMain + 816
28 dyld 0x00007ff8030083a6 start + 1942
I get a crash just adding a bloc. And I am finding the top global area vanishes suddenly and randomly. It’s not in preview either.
Blocs_Build8_Adding_Bloc_crash.zip (13.6 KB)
Adding a Bloc can be a mission on its own. Either it needs to be fully visible or nearly completely hidden to be able to add one.
Is this a custom Bloc you saved or one that came with Blocs?
Had it with both. A single column bloc, and a custom bloc is just a bare bones one for Offcanvas, nothing special.
The crash log, maybe from the custom one.
I’ve found the cause and have this patched up ready for todays beta release. I’ll include more info relating to it in the build 9 forum post so please check back for more details.
Sorry for the wait.
Still tracking this down. Did any of the Blocs have custom Brics in?
Nope. Just divs, all made with blocs bits and pieces.
What about fonts, anything you installed used in the Blocs?
Nope. You should have the offcanvas bare bones bloc.
You need to add the offcanvas bric for it to be visible because it has offcanvas classes in it. Nothing else style wise that I recall.
Maybe it’s the combo? It’s never been a problem before
Im not sure yet, @Jerry also had a Bloc crash which corrected itself with a re-install. I’ll look at this more tomorrow and aim to get something in Wednesday beta.