Getting multiple segfaults when using Gnome3

I recently switch to Arch linux for my work computer, and decided on Gnome3 for my WM. Everything looked good however I have recently been getting very odd behavior that is hard to describe.
Gnome3 seems generally unstable, and I say that because I have been frequently been getting the "Oh No.." error which then crashes the window manager and kicks me back out to GDM. Also, the online accounts functionality gives me gnome-keyring errors when trying to remove accounts (I think this might be because I changed my password). Evolution hangs when loading my exchange account, crashes, has trouble syncing my calendar, but then magically starts working again after a restart. Just today I changed my desktop background and got an "Oh No..." error.
Trying to investigate these issues and haven't found much in the way of logs. I am used to seeing /var/log/messages but that does not exist on my system. I did however find these in dmesg:
[ 180.763980] mission-control[805]: segfault at 0 ip 00007f686f38b360 sp 00007fff071ec2e8 error 4 in libglib-2.0.so.0.3400.3[7f686f353000+f4000]
[ 278.351169] dconf worker[914]: segfault at a ip 00007f8a33bb17f2 sp 00007f8a1d5cb9a0 error 4 in libglib-2.0.so.0.3400.3[7f8a33b4f000+f4000]
[ 961.020095] evolution[2046]: segfault at 8 ip 00007fdb88d89fa8 sp 00007fff01e02d60 error 4 in libpixman-1.so.0.28.2[7fdb88d32000+91000]
[ 9174.786628] soffice.bin[3191]: segfault at 7f2aeb006182 ip 00007f2aecb67f7d sp 00007fff837271b0 error 4 in libmergedlo.so[7f2aebf15000+2d92000]
[11892.209189] mission-control[2019]: segfault at 0 ip 00007f028bae6360 sp 00007fff1f590b08 error 4 in libglib-2.0.so.0.3400.3[7f028baae000+f4000]
[13693.700127] mission-control[5266]: segfault at 0 ip 00007fd7cb0f8360 sp 00007fff7247c8f8 error 4 in libglib-2.0.so.0.3400.3[7fd7cb0c0000+f4000]
What is going on with my glib2? The frequency of segfaults and the applications involved suggest that this might be my problem. I just reinstalled it with pacman and so far so good, but the nature of this problem doesn't give me too much confidence that it is fixed!
TIA,
Trann

...so look in the Event editor (just hit E ) and see if the doubled notes are on the same or on different midi channels. If the doubles are duplicates (same length, same velocity, same channel) then you have a MIDI loop and need to set your keyboard to local off, as pointed out.
To get rid of the duplicates you already have, select all notes (⌘-A) in the editor and hit D .

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