I’m only just beginning with barely 2 hours of tinkering. I bought the latest Blocs 2.6.4 and Elder’s course to help me through.
Macbook Pro 2013, OS 10.5.5
After trying to familiar myself with the interface for real (not just watching tuts), everything seems fine. When ever I am ready to stop playing, I go - file-save and I see the name change from MYsite-edit to Mysite so I think that is fine.
When I exit Blocs however I always get pages and pages of error text and the site isn’t really saved anywhere???! Not sure what the heck is going on.
Here is a brief beginning the the error message if it helps.
Process: Blocs 
Version: 2.6.4 (201)
Code Type: X86-64 (Native)
Parent Process: ??? 
Responsible: Blocs 
User ID: 501
Date/Time: 2018-09-20 14:50:25.015 -0700
OS Version: Mac OS X 10.10.5 (14F2411)
Report Version: 11
Anonymous UUID: 4FCE7304-3B41-65C6-CEE2-AF2FDE6D1D1B
Sleep/Wake UUID: 811015AF-8AF4-4B92-8833-1072B84AE9BD
Time Awake Since Boot: 160000 seconds
Time Since Wake: 1100 seconds
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000000
VM Regions Near 0:
__TEXT 0000000100fa5000-000000010110d000 [ 1440K] r-x/rwx SM=COW /Applications/Blocs.app/Contents/MacOS/Blocs
Application Specific Information:
Performing @selector(terminate:) from sender NSMenuItem 0x6000000b2360
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 com.Blocs-2 0x0000000100ffdfca 0x100fa5000 + 364490
1 com.Blocs-2 0x0000000100fda129 0x100fa5000 + 217385