I keep trying to create a backup of my wallet, then I get an error saying "There was an error with the backup creator, the operation has been cancelled to avoid making bad backups!", then I close the wallet properties and a blank window pops up that I can't close. I have to force quit Armory to get rid of it. This issue affects all of my wallets
There are actually two problems here. First, is that you got this error: "There was an error with the backup creator..." The second problem is that Armory crashed when displaying that error.
I only fixed the second problem so that Armory does not crash when you get that error. It is still a mystery how and why you got the error in the first place. To help figure this out, please send us your logs.
From the code it seems as if you must have been creating a fragmented backup. Is that correct? If so, you can at least create a single sheet backup for now.
The important thing to note is that it's not worth the effort of building from source at this point, you will most likely still see the error without the crash.