Little boxes on facebook instead of text?

[Tom]

For the last few months now, when on facebook on my laptop instead of text there is just little boxes, anything people post such as statuses appears as normal however anything such as like/share/comment buttons appear as boxes as does the home button and basically any text that isn't posted by a user.

Yesterday, my friend logged on to his facebook on my laptop and I noticed this problem no longer occurred, however when I logged back on to mine the boxes were still there, does anybody know how I can fix this?