XF 1.5 GIF's not working on my site?

[Xyphien]

"
The following error occurred
Security error occurred. Please press back, refresh the page, and try again.

test.gif"

Whenever myself or another person on the community uploads a GIF they get this error. As well as when they try to use GIFs they get this image:

*The one in the middle*

This was a test I did. I personally got three of the four GIFs to work. However, one did give me the X image. Another member said every GIF he uses gives him that image.

"Allowed Attachment File Extensions"
include
"
zip
txt
pdf
png
jpg
jpeg
jpe
gif
"

So does anyone know the reason behind this? My site is upgraded to https, however one of the four images I used was an http just to test to see if that was the issue. The http GIF worked without any problems.

 

[Paul B]

The fact that you can upload some gifs indicates the issue may be at the server level (settings), possibly related to the size of the gifs which are failing.

 

[Xyphien]

The fact that you can upload some gifs indicates the issue may be at the server level (settings), possibly related to the size of the gifs which are failing.

See that's what I was thinking. But the fact that all other members can't upload any makes me wonder. I have another xf site running through the same host and I haven't had a problem with gif on that site.