Super simple question

[ForeverZer0]

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class QuickMessage < Sprite
  
  def initialize(message, timer = 160)
    super()
    self.bitmap = RPG::Cache.picture("message")
    self.x = 32
    self.y = 32
    # I don't know what the pic your using is, so you'll have to adjust the
    # values of the x, y here.
    self.bitmap.draw_text(0, 0, self.bitmap.width, 32, message, 1)
    loop {
      Graphics.update
      Input.update
      timer -= 1
      break if timer == 0
      break if Input.trigger?(Input::C)
    }
    Input.update
    self.dispose
  end
end

This is easier.  Same syntax, but use QuickMessage.new instead of QuickMessage.show
You need to change the x and y of the sprite, and the coordinates where the text is drawn maybe, but it will be self-centering.

[mroedesigns]

now it's doing the same thing as before, no error but no text either. And for some reason it shows a blank text box as well. Like if you did an event showtext and left it empty, it just pops up and then goes away when the image does.

[ForeverZer0]

Then you're not passing text to the method.  What string are you using?

[mroedesigns]

QuickMessage.new('Items Received')

[ForeverZer0]

That script call:

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Result (just made some dummy picture with rendered clouds for example)

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What other scripts are you using?

[mroedesigns]

In order;

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RMX-OS Options
RMX-OS Script
RMX-OS Versioning
Global Variables and Switches for RMX-OS
Single Instance
Actor Class Mod
Quick Message Script
Quest Log
- Quest Logs RMX-OS Controller
Equipment Requirements
Passive Skills
A.T.E.S.
Global Day & Night for RMX-OS
Blizz ABS
Visual Equipment for Blizz-ABS
Blizz ABS RMX-OS Controller
Ring Menu
RMX-OS Main

Single Instance is just a script to keep players from opening multiple game sessions at once. The Actor Class mod is a script that replaces all instances of the actor name with the rmx-os network username.

[ForeverZer0]

I don't anything there that would prevent the script from working.  The only thing that I know that really COULD even screw it up would be something that alters the Sprite or Bitmap class.  Also there is no reason a blank text box is being displayed.  Somewhere, you have another script that is doing some screwy stuff.  If you want, PM me a demo of your game and I'll look at it.