I was testing snap for a while on openSUSE Leap 42.2 and it was working fine (or maybe I was lucky). After Xmass break the problems started to occur and mos of apps do not start anymore.
With some apps I can see some backtrace on others there is nothing - for example with discord 0.0.3 (rev 41):
** Gtk-Message: Failed to load module "canberra-gtk-module"**
...
** [7214:1227/183835.332046:FATAL:platform_font_linux.cc(63)] Check failed: typeface. Could not find any font: Noto Sans, sans**
#0 0x000001dffe4e <unknown>
#1 0x000001de571b <unknown>
#2 0x000001a64f2d <unknown>
#3 0x000001a64b6f <unknown>
#4 0x000001a65826 <unknown>
#5 0x000001a723e9 <unknown>
#6 0x000000b2b2ae <unknown>
#7 0x0000009fcb93 <unknown>
#8 0x000003c22086 atom::api::WebContents::InitWithSessionAndOptions()
#9 0x000003c2290f atom::api::WebContents::WebContents()
#10 0x000003c2d806 atom::api::WebContents::Create()
#11 0x000003c3fab5 atom::api::Window::Window()
#12 0x000003c415cc atom::api::Window::New()
#13 0x000003be7570 mate::internal::InvokeNew<>()
#14 0x000003be7700 mate::internal::Dispatcher<>::DispatchToCallback()
#15 0x7f60d246af9f <unknown>
#16 0x7f60d20154eb <unknown>
#17 0x7f60d2014fa9 <unknown>
#18 0x35b8db3843a7 <unknown>
Failed to generate minidump....
In other apps the gtk theme and font errors are repeating. Of course I have canberra module and fonts installed. I’m curious if you experience similar problems or is it just me ? 
With some of the snap applications I was able to revert to previous revisions and some of them worked fine.
**
Maybe this is a problem with outdated snapd in the snappy OBS repo ?** 2.27 is from September and the current one is 2.29.x. Fedora guys already have 2.29.x version and it looks like it solved some of the problems - link