Ok my problem is not very serious but annoying nevertheless...When I upload .jpg files as thumbnails, they only appear when someone opens the thread. However, when I open the particular forum (in this case, Bangla Drama >> H. Ahmed), it simply saws 'NO THUMBNAIL AVAILABLE' next to my thread when I quite clearly have 3 when you open it.

The name of my Thread is 'Tara Tinjon by Huyamun Ahmed' and it is at the top of the list.