Display Shows Tiny Icons and Text (On Non-Primary Display)

I have a Lenovo ThinkPad Yoga running WIN 8.1. Its screen resolution is set to the recommended size of 1440 x 900.

The laptop is connected to a second monitor (Acer V196WL) that is set as the main display. Its screen resolution is set to the recommended 1920 x 900. This set-up worked fine until a few days ago after I connected the laptop to a projector. Since then, the icons and text are extremely small on the laptop and so-so small, but workable, on the external monitor.

I have the "make text and other items bigger" setting at medium (recommended). The "let me choose one scaling level" text box is unchecked.

It appears that the medium setting is actually displaying at small. When I bump it up to large, it displays as if it is set to medium.

An EE member suggested that I change the laptop to main display, which I did, and I thought that this resolved the issue (so I closed the question). However, when I switched back to using the external monitor as the main display, the problem reappeared. So, the additional data point is that the secondary display renders incorrectly, but the main display renders correctly.
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You must have confused something. A resolution of 1920x900 is a very strange resolution, I never heard of it. Normal would be 1920x1080 for a high definition display. But I checked your display, and it's max resolution is 1440x900 (the same as your thinkpad's internal resolution). Try changing the resolution of your external to 1440x900 and I think it should work fine.
cnealyAuthor Commented:
That was a typo:
The Acer is already set to 1440 x 900.
The Lenovo is set to 1920 x 1080.
Then maybe your lenovo is set wrongly, or is that a typo too? According to your question it supports 1440x900...
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cnealyAuthor Commented:
I'm using the Lenovo right now without the external monitor. It is set to 1920 x 1080 and all of the icons are still very tiny. I have zoomed my browser window so that I can at least see what I'm doing. But, for instance, when I right click on the desktop to bring up the display options, the menu is as small as a 4-6pt. I asked a colleague to look at it just to validate what I am seeing, and she is seeing the same thing.
cnealyAuthor Commented:
I did a system restore which resolved my issue. I still don't know what caused it, but system restore fixed it. I am now set at native resolution and the scaling looks normal.

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cnealyAuthor Commented:
Unable to resolve issue by changing all available settings, so the best available solution was to do a system restore.
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Displays / Monitors

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