Active pictures turn into boxes?

[Thanks_i_hate_it]

So me and my project partner have been using different computers for our game. However every time we switch our active pictures freak out and turn into these gray boxes capture.l..PNG. How do we fix this? is this due to my flash drive? Everything else is fine, it is only the active pictures that do this
Our game is due on the 9th, and we need people playing it sooner.
This is a school project.
Thanks in advance.

[denisstephane]

It is necessary to place the image which must be inside the active picture in "data elements" -> external files, otherwise it is not to keep.