Photoshop Text Font size input box is empty

[officesiren]

Hey! I have no idea how this happened as this is the first time it has happened to me. I've been trying to look for other solutions or people who have run into the same issue as me, but to no avail.

Basically, the text font size input box at the top toolbar is empty. I can still change the font size thru the toolbar and by using the character panel.

However, when typing in the value for instance 150px and switching to a different document with text, the text will jump to the previous size value (150px) when trying to adjust the value thru the top toolbar.

I'll insert screenshots and hopefully a video to further give a visual understanding of my situation.

Video 

Hopefully it's a simple fix! Thank you in advance!

[c.pfaffenbichler]

What have you done for all-purpose trouble-shooting so far?
Restoring Preferences after making sure all customized presets like Actions, Patterns, Brushes etc. have been saved might be a good starting point:
https://helpx.adobe.com/photoshop/using/preferences.html
https://helpx.adobe.com/photoshop/kb/basic-trouble-shooting-steps.html
https://helpx.adobe.com/photoshop/kb/troubleshoot-gpu-graphics-card.html