Gmail Not Attachment Failed

I use gmail forever and I never had any problems. Since 3 days ago my gmail - including the business account - does not attach a small file such as 25K. The message I keep getting is "Attachment Failed". I keep retrying and nothing happens. I already followed all the steps suggested. My Adobe Flash is updated and able. Not sure what to do. Any advice? Any one having the same issues? I use a MacBook Pro and my main browser is Safari.
Thanks a lot