In my LFS build I installed the NetworkManager Applet. A panel applet used to configure wired and wireless network connections through GUI.

When I boot into xfce4 via root or user account, it displays for a few seconds a box in the upper right corner of the screen, saying I'm connected to the notwork.

Sometimes it will display as a small grey box, sometimes as a longer, wider grey box and other times, as a wide colorful box showing a duration time for how long it will display.

I have no idea why it displays differently. The information on it is always the same. It's amazing how small things like this can just eat at you. Any ideas?

lmao. Theming possibly???? Here is a great reply regarding xfce theming that helped me be okay with it (or find better theme packages). https://forum.xfce.org/viewtopic.php?id=8787

I'm not changing the theme. I'll just sum it up to Linux goofiness.

Because every hardware/peripheral and services support Microsoft Windows by default. In Linux it may or may not work. If it doesn't then you have to do all the hardwork, and not the vendor.

veerain, did you even read the OP?
Anyway, GameCodingNinja, neither NetworkManager nor Xfce are Linux, which is the kernel or, by extension and given enough context and no R.M.Stallman around, the OS.
Bringing here such a goofy misunderstanding ain't going to help you, and saying "I'll just sum it up to Linux goofiness" sounds like trolling. But you're not a troll, I saw some others threads of you.
And re: theming, the fact that you're not changing the default theme doesn't mean that Xfce doesn't use one.
I don't use NetworkManager or Xfce, so I can't be of much help, but I guess it could be a race condition between the Xfce theming, the notification manager and/or the NM applet: depending on which is ready first, you see a slightly different result.

Frankly I didn't understand your comment. What is OP?

Sorry, wrong. There are MANY devices that aren't supported by Windows AT ALL, because Microsoft hasn't written a driver for them, or the company that makes such products hasn't released anything to Microsoft. Many pieces of hardware for *nix ONLY, or designed for Mac hardware.
What hard work are you talking about? Writing your own kernel-based device driver??
OP = "Original Post" and/or "Original Poster"

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That could the reason. Thanks for your help guys.