At first, I thought this problem was limited to BW, so I just got rid of it and decided to jump to another app, but then I found that HD widgets didn't work, and another similar clock/weather-style widget group wouldn't work. Thinking maybe I had created some sort of data corruption, I did a factory reset, which worked for a while, but eventually the widgets stopped working again. After rooting, and finding that the problem still existed, I factory reset again, and started putting my apps back on one at a time, testing to see if it was a conflicting app causing the problem. No luck. The widgets worked until some random time when they simply no longer would.
I finally resolved to go without this kind of widget, since it wasn't a necessity, just a convenience. The problem is that I've now noticed that other kinds of widgets aren't working, either, including some that I'd really like to have work, like the Tasker timer widget.
Has anyone else noticed this problem occurring on their Verizon S5s? I'm going to look into which widgets actually still work (because some do), and which don't, and compile a spreadsheet, see if I can come up with a reason. I doubt I'll be successful, but it might be useful for other people who actually know how to fix things.
PS. Another weird thing is that the widgets stick to Nova Launcher homescreens just fine. Now, that would be okay, except that I want to do some theming now that we can flash some ROMs, and I thought that theming only applies to the stock launcher. Plus, I'm guessing that this isn't normal behavior and I do want to find out why it's happening, not just use a workaround.