Burn button blank on a few DVDs

[XSlim]

I tried burning Windows 7 on a DVD for a computer. I clicked on "Write image file to disc" and put my ISO. I then found out that the burn/write button was grayed. I know I fixed it (inserted a different DVD) but it still was strange.

[LIGHTNING UK!]

This won't be a bug.

It'll be your drive not liking the disc you've put in it and not being 'ready' to burn.

When it happens again, make note of what's written in the status bar at the bottom of the main window.

[dbminter]

It may not have been a blank DVD you tried writing to, particularly when you said you inserted a different disc and it worked fine.  There would have been an identifying message at the bottom of the main ImgBurn window saying something like "Cannot write inserted media.  Not a blank disc."