EDIT: (I wish I could edit my original comment) -- It turns out, I was using a Mask that was hiding it, because the caret is so far to the left when there are no characters written out in the InputField. Hmmm hope this is not to hectic to adjust then!

Caret still doesn't appear when InputField's text is empty, in Unity 2019.2.0f1, despite being selected. Not completely fixed.

When there *is* text in the InputField, however, it does properly show the caret.

Posting for myself for future reference and may help others,
in Unity 2017.4.22f1 can write, but missing caret. Solved by deleting other added elements in the InputField group
https://i.imgur.com/JbWE48e.png
Caret goes invisible when other objects added because the caret is spawned as first sibling in hierarchy and blocked by other elements

Issue still present in 2018.1.9f2-MLTP10

Is it possible that some people with this problem have the wrong text size for their input field? I noticed that even though the text didn't appear on the screen, the text field was still taking input. So I selected "best fit" for my text size and suddenly my caret and text appeared again. I felt like an idiot.

Not sure what's going on for the people whose input fields aren't taking input, though.

version 2017.3.0f3. Windows 10 desktop.

No caret, no text, no input in input field. Field can be clicked, highlighted, etc... but takes no input.

I have this issue in latest version of Unity. I have a panel with 8 input fields the 4 on the left have no caret but the 4 on the right have the caret. They all have the same caret settings in the inspector. Please fix this.

AUSTINBORDEN, same here. I'm using Unity 2017.0.0f3 to develop a VR app and it is really annoying not having the caret.

Please fix! Thanks :)

This still happens in 2017.3.0f3. Caret is there but not visible like previous poster said.

version 2017.1.0f3

Caret is there as an object but invisible.