Refresh rates over 80hz suddenly hidden in Windows 10

[Margatroid]

I have an Overlord X270OC which I've been running for a while with settings in CRU that go up to 120hz. I'd left the monitor set at 64hz for a while because I hadn't been playing any games lately, but today I went to set it to 120hz and I found that the settings for 100 and 120 had simply disappeared. I tried re-adding them in CRU, tried updating my graphics driver and restarting the computer, etc, and nothing helped. The only settings visible under Display Adapter Properties -> Monitor are 64hz and 80hz.

There was just a major Windows 10 update recently, and I'm thinking this must've been what caused the issue. Looking at the "events" tab in the monitor properties, it looks like some stuff happened 9 days ago:



Anyone have any idea how this happened, or how I could fix it? It seems somehow Windows has just forgotten that this monitor is capable of displaying higher refresh rates, despite the settings in CRU. Maybe it's something with that .inf file?

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More detailed info from the Events log:

Device DISPLAY\HYO049B\5&3a77d74d&1&UID8452 was migrated.

Last Device Instance Id: DISPLAY\HYO049B\5&3a77d74d&1&UID8452
Class Guid: {4d36e96e-e325-11ce-bfc1-08002be10318}
Location Path:
Migration Rank: 0x0
Present: true


Device DISPLAY\HYO049B\5&3a77d74d&1&UID8452 was configured.

Driver Name: monitor.inf
Class Guid: {4d36e96e-e325-11ce-bfc1-08002be10318}
Driver Date: 06/21/2006
Driver Version: 10.0.17134.1
Driver Provider: Microsoft
Driver Section: PnPMonitor.Install
Driver Rank: 0xFF2000
Matching Device Id: *PNP09FF
Outranked Drivers:
Device Updated: false
Parent Device: PCI\VEN_10DE&DEV_13C2&SUBSYS_85081043&REV_A1\4&b857930&0&0009


Device DISPLAY\HYO049B\5&3a77d74d&1&UID8452 was started.

Driver Name: monitor.inf
Class Guid: {4d36e96e-e325-11ce-bfc1-08002be10318}
Service: monitor
Lower Filters:
Upper Filters: